Well, since it goes both ways, just start calling people like this filthy, disgusting names, and insulting their family. If you can't take it, GTFO. Apparently it's legal, so why not?

If you're just going to throw consideration out the window, why should I adhere to those rules, when others clearly wont?

I'm not saying it's appropriate, or even right. But if you have to sit there and listen to the rude toxicity of these people, I say go ahead and give it right back.