Not at all. That stupid, lazy, limp-dicked knuckle-dragger should know that such behavior is unacceptable. He needs to go f**k himself sideways. On his way straight to Hell.
Now how would he like it if you said the above to him?
All couples fight, of course, but there are rules even to fighting. One of those rules is to keep your temper and your tongue in check. The causes of a fight are quickly forgotten -- chalk most up to hunger, exhaustion, PMS or booze -- but nasty words said in anger are impossible to forget.
In many ways, verbal abuse can be as bad or even worse than physical abuse. I'd almost rather be slapped upside the head than have to listen to someone say horrible things about me that will bounce around in my noggin for years to come.
I've known people like your boyfriend. Some just have a bad temper, but others seem to think that it's okay to throw aside the gloves during a fight and say whatever they want because, hey, it's a fight and all will be forgotten and forgiven when you make up. Too bad real life doesn't work that way.
Yes, we've all said things in the heat of the moment that we later regret. None of us is perfect. There's a difference, though, between losing control once or twice and losing it every time you have a disagreement. And then defending it.
Now I'm going to say what you already know: your guy's bad temper doesn't bode well for your relationship. He needs to get a grip on his anger and you need to think about what the future holds. I'm sure you are aware that it's not a big leap over Abuse Creek from the verbal side to the physical side. If he hasn't made it already, he will, unless he realizes he's wrong and starts working to control his temper.
Talk like a girl. Gimme a fecking break.
Here's more info (and a handy list) about fair fighting. I've got him down for about 5 of these already.