Why don’t guys like to eat ass?

So so I’m 16. My boyfriend is also 16 and when I was taking a bath one day, I discovered that I like the sensation of something wet around my butthole area so I asked my boyfriend. Can he eat my butt he said no just flat out no I offered to do it for him in return and he said it was gay and that if I went anywhere near his butt during sex he’d break up with me a few weeks later I asked him again would he eat my butt and he said maybe only a few licks and he said out of all things you ask why do you want me to do that? I explained to him why and he said I was weird.

So are all men like this?