my gay bsf is weird about other women. how should I handle it?

I literally never make reddit posts, I have no idea where to start or how long these things should be lol but I like to be detailed as much as I can. This will be long, I apologise. 😂

Basically my best friend who we'll call Onyx, I have noticed has a weird behaviour when it comes to women or conversations about women. Not in any kind of major aggressive way, he's just, like the title says "weird" about it.

Pls lmk if I am overreacting though I don't think I am as I haven't even reacted and I'm trying to get advice around how to handle it before I do. I am not looking for any advice thats like "stop being friends" because this is my best friend I love him very much and this is just the one thing that makes me uncomfortable when I talk to him.

So I don't have a lot of examples because I tried not to think anything of it but I have a few things that might give context as to his character. Onyx and I have been friends for 5 years and gone through a lot together but I'm not blind to his flaws. He likes guys who have partners is a pattern of two so far. Coincidence? Maybe. The first boyfriend I was around to see Onyx have was in a relationship with another person. This person was nonbinary and also happened to be afab and fem presenting. The first boyfriend got with Onyx like a week or something before properly breaking up with the other person.

Onyx and the first boyfriend broke up like two or three years ago I can't remember which year ngl. Now earlier this year, Onyx went on a rant about this new guy he thinks is really cute in his college group thing and he went on to find out that this guy had a girlfriend and complained. Valid enough. Then Onyx went on to invite this guy to a discord server with me and some others but it's really only me and Onyx that genuinely are active (had maybe 4-5 people, one of which including another one of Onyx's friends from college). This guy who has a girlfriend, we'll call Maddox. Maddox obviously talked about his girlfriend a lot because who wouldn't when they love their partner? However Onyx constantly would make a grimace or dm me privately saying how annoyed he was whenever Maddox mentioned his girlfriend. I told Onyx that like yeah it's fine to feel jealous, can't help your feelings, but it got to a point where I had to tell him gently like "hey you might wanna relax a bit" and Onyx was like "yeah I know" and ever since then he's been actually doing better and not visibly looking annoyed or grossed out whenever Maddox's girlfriend is mentioned. We even played a game with her and Maddox the other day and it was mostly fine.

Other than those things there's only a lot of small/vague examples I can give that purely feel like a "you just had to be there" situation to gauge the tone.

Other small examples being:

1. Whenever there is any woman in media we are watching/playing, he usually (like 9/10 times) hates them or dislikes them. The only positive acknowledgement he can ever give female characters is "I like the design" or "hey koi I think you would like her" (because I mostly like women). Nothing about story or personality unless it connects to a male character. I'm sure there are a few characters he likes but I really can't think of any.
2. The one time in which I told him "you never like any of the female characters" I said it lightheartedly and he genuinely didn't have a response he was like trying to deny it and said "I like this female character.. sometimes" and I was like "yeah exactly only sometimes." He started saying something like "it's not like" or "not that" then went quiet and we moved on.
3. Any time I try to talk about my female fictional character crushes (as we both mutually do) he shows absolutely no sign of caring whatsoever until I tell him about a man he LITERALLY will snap to and be like "OO! What's he from?" yada yada. Before even verifying if he finds this character attractive too. It's just purely that he hears "he" pronouns and decides that then it's worth listening to.
4. Onyx always tells me about this one coworker he hates and hopes gets fired or quits and whenever he tells me what she did I'm always left sitting there like.. okay so what did she do to make you hate her THIS much? Or it's something that genuinely makes me be on the coworkers side.
5. He also hates this one girl in his college class because as he said "she's one of those girls who thinks everyone wants her boyfriend" and from the TikToks he sent me of her, she does give that vibe but also given Onyx's track record, I don't know it felt odd to me that THAT was his example of her personality. Rather than she's stuck up or passive aggressive or anything.

So he isn't like a crazy misogynist or anything but I genuinely do think he has some issue with women or respecting women at least because I think I am the ONLY one he has ever not talked negatively about in some way/cared about at all? I don't know if that's because I've never been in a relationship with a man so he's never acted weirdly towards me, plus I'm kind of categorized as a lesbian to him?

Any advice on how to handle it because it's starting to make me uncomfortable whenever he does these little things. I don't think confronting him dead on would be a good idea, but I'm open to anything really I just feel weird about it and don't want it to become a bigger thing as we've had our fair share of friendship drama and he's an extremely sensitive person.

Also any ideas on why he might act like this would be much appreciated! Sorry this is sooo long! <33