I've heard very few people suggest that no one is allowed to say anything that offends anyone, anywhere. I don't really see the application of your "point", are you suggesting that people shouldn't be bothered by racial slurs/discrimination because people are also bothered by defenses of racism? That line of logic doesn't really follow.
I used to be big on the "anti-PC" bandwagon, but I think these days the cure has become worse than the disease. People criticize political correctness as an excuse to avoid talking about serious issues. The anti-PC crowd is just as focused on how people talk as the hardcore PC people you find on tumblr, only they want people to be politically incorrect rather than politically correct, hence Trump's appeal despite him not having formulated policy positions on all but a couple issues during the campaign. I get that memes are supposed to be jokes, but it sort of plays into that. If you think racism is no big deal, fine, deal with the issue head on and make an argument for why it's no big deal. Don't just make snarky comments about people who "demand PC".