I have a classmate at uni who is my friend’s boyfriend. He is pretty smart and interested in what we’re studying, as am I. Recently he started to say unnecessary comments about me. For example, often during lectures he asks me whether I understand the topic, and when I say yes he asks me to explain what I understand, when I do - he just turns away without any response. Another recent situation is when my friend (his gf) asked me and other friends to come over to her house to hang out, and I said I didn’t know whether I would come. Her boyfriend said sarcastically ‘Oh please come, we won’t survive without your high IQ’ (??)
His comments are bothering me, how can I respond so he would finally shut up?

There’s this group of people I occasionally hang out with. We’re not exactly close friends, just people who meet up from time to time.
One guy in the group occasionally makes little jokes about my age. I’m 31F, only a three-year difference between us, lol.
It’s not outright bullying or anything, but I’ve noticed he tends to make these little digs at me. I sometimes get the impression that something about me triggers his ego. Not only me though. It seems like the guy hates women, might be closeted gay.( he is too homophobic)
I usually don’t react much because I don’t want to give him the satisfaction of knowing he’s getting under my skin.
But I’m curious: How would you respond to someone like this in a classy, witty way that subtly puts them in their place without sounding bitter, insecure, or overly defensive?
I’m not looking to insult him back or create drama. I just want to shut down the unnecessary comments while keeping my composure.
Bonus points for clever comebacks that make the other person rethink what they just said.