Dealing with loudmouths

[Jack-of-all-trades]

Hi forumers. You know, whether in a league match or just a pick up game, there will always be at least one attention whoring loudmouth who will regularly talk crap, put others down (who would also tend to be the most incompetent player on the field). Just wanna ask, how would you deal with these sh*t talkers on the pitch?
No joke, lately I've been rather demotivated with a couple of these jokers around the pitch. At times I just feel like body checking or sliding tackle knocking the f**ck out of these haters, though I haven't actually had the courage to do so yet.