Generally derisive terms only work to reinforce the belief within the group that's already antagonistic towards whoever you're mocking. Since the common man parrots the mainstream left talking points, they'll laugh at teabagger because they've already been convinced that libertarians are evil tax dodgers who want to take all the money from poor black schoolchildren. Now, since teabagger is describing a homosexual sex act, you could more accurately use it to refer to a gay man derisively, but try making that joke in mixed company and suddenly all those people who laughed at the anti-republican thing are horrified that you'd use such a dismissive and cruel term to describe those noble heroes who simply want the government to recognize their sacred right to squat over one another and orally stimulate each others' scrotums.
You've got to convince the world that SJWs are assholes first. Then everyone will get the joke.
You've got to convince the world that SJWs are assholes first. Then everyone will get the joke.