AITA for getting angry at my brother-in-law for commenting on my fiancée?

I was on the phone with my sister and her husband earlier today. My sister had posted some pictures on her story, and I told her she looked cute in them.

My brother-in-law then said:
“Your fiancée looks really cute too.”

I instantly got angry and told him that was completely over the line and that he shouldn’t be commenting on my fiancée at all. He replied:
“Why can you comment on my wife then?”

I told him:
“Because she’s my sister. That’s completely different. You are not related to my fiancée.”

Then my sister started laughing and said:
“Why are you getting so pressed?”

At that point I got even angrier because I felt disrespected by both of them, so I hung up.

For context, this isn’t the first time I’ve felt uncomfortable with his comments. In the past he has said things to me like:
“I’m taking your sister on a date”
and
“Now your sister is going to give me a back massage.”

I know she’s his wife, but I personally find those comments weird and unnecessary to say directly to a brother.

I come from a Muslim/conservative background, and in my opinion relationships between in-laws should stay respectful and somewhat formal. I don’t think men should comment on other men’s wives/fiancées, even as jokes.

After the call, I texted my sister saying that several of his comments lately have crossed my boundaries and that I expected her to speak to him about it.

AITA for reacting the way I did?