you broke up with him, yet you're pissed at him trying to act cool about it when that's probably his way of getting over it? I think he has every right to make fun of you for crying over him when YOU were the one that broke up with HIM.
If you broke up with him, then why should you be crying?
If you were crying over your lost relationship, then he has every right to laugh at you. In fact, I would do the exact same thing.
If you were crying over something else, then he doesn't have a right to laugh at you. You shouldn't kick his a** though. That's way overboard for something like that.