He said his best friend’s wife was more attractive than me.

[WTAFFF]

My DP said today that his best friend’s wife was better looking and more attractive than me. I didn’t ask him this question.

He can’t understand why I might find this a bit hurtful. AIBU?

because I knew he rated me (much) lower I'd have dumped his ass then. Fucking dick who does he think he is.
Higher your expectations OP you don't deserve or want anyone's rate.
I'm glad you have not heard from him work on raising your confidence.

Whether male or female you shouldn't find anyone more attractive than the one you are supposed to love.
My dh is the most attractive man in the world, to me. I don't care what other women think about his looks.
I know my dh feels the same.
We've been married 30 years, and yes, still look at other attractive people, they just aren't as good.

He's pushing your buttons. When he said she was a solid 9/10 you should've gathered your things and gone home. Men learn from actions not words. Take yourself away from this disrespectful situation, don't play tit for tat, be the bigger person. Do you live with this guy? If not, I would give him a wide berth for a while, let him think about what he stands to lose by being so insensitive.

P.S. My partner once told me that all of his ex girlfriends had big boobs (mine are small). It was a button push to see how I'd react (this is how a lot of men play because they are insecure and need your jealous reaction). I told him how glad I am that I don't have large boobs because A. All of my friends who have them, hate them (one friend even had a reduction!) and B. The smaller they are the less there is to sag. My comments rendered him speechless.. silly little man trying to play games with a woman of the world ;-)