I don't get sexualities that only feel attracted to one gender

Idk, if someone else relates to this. But I was thinking about it today. I'm pan/demisexual for context.

I see people makings transphobic jokes about trans women in social media/real life and doesn't make any sense. Like, if you like women and the person you are interested in looks like a woman (I won't take the part that trans woman are/feels like woman, because those people don't consider this), then what is the problem?

Same with other situations. I don't get why lesbians don't fell attracted to guys that looks like woman (femboys, for example), gays don't feel attractes for masculine woman and straight people don't feel attracted for someone who looks like the opposite gender.

I know that since I'm pansexual, I can't really say much about it. But I can't imagine feeling different about my boyfriend if he was a woman or non-binary, like he still would be the same person I fell in love.

The same happens a lot with the sexual attraction too. I don't understand how you can feel horny for someone you don't know or didn't even have a strong connection. Feels so... Weird? I think.

Anyone else feels like this too?