Most of the guys I have been with have enjoyed porn and I have watched it with them. For the most part it hasn't bothered me, but then again I haven't had to deal with insults of the type described here.
What exactly is a "better one" in porn, anyway? You can't touch, taste or enjoy it in any real sense - if he's one of those guys who'd rather stay in fantasy-land than the real world then that's where he'll end up - sitting in a dark room by himself staring at a screen jacking off. And that's where he should be, for insulting someone who he supposedly cares about (I assume) like that.
It usually doesn't bother me when my boyfriend looks at women in porn because I know he's aware that not only are they not actually real, but if he were to try and interact with them as people he'd likely be disappointed. That's because I'm with a guy who cares about a women's personality and who she is, not just how she looks. Every once in a while when I'm feeling particularly insecure, however, it does bother me a bit. I usually get over it after some rational contemplation and judicious tongue-biting.
The bottom line is, porn can fit into a healthy relationship where each partner feels respected and wanted. Just about any man will look at porn, it's how they relate that with the woman they are involved with that counts. If it's used as a substitute or means to insult somebody, then it's not the porn that has to go, it's the offending party.