People can come up with amusing graphs, charts, and statistics to "prove" any point while mocking the other side with a bit of creativity, in reality it's meaningless and mostly tends to only serve the purpose when your in a vacuum chamber with people who agree with you and can laugh at it.
Social Justice Warriors have been around long before the term, it's just been over the last few years that it's been a problem. As long as I've been involved in geekdom people have been trying to make an issue out of things like fantasy artwork and the way comics portray the human physique, it's only recently that people like this have started to rally and be taken seriously.
Back before the WWW on Echos (message boards shared between BBS systems, with the contents very slowly distributed through hubs) some of the RPG forums like the ones on Fidonet had a joke about "who saved your ass". It was a cultural commentary that sort of showed that realistically speaking most "heroes" by modern standards are indeed militant white guys (the stereotype has been around for a long time). Exceptions of course exist, and it's not meant as a serious point, but the bottom line is that the US and European militaries and support organizations tend to run around performing charity, maintaining order, and rebuilding all around the world, forming the backbone of what even the UN has to work with. As a general rule your typical real world equivalent of an "action" villain nowadays is likely to be "ethnic", and ultimately brought down by the US or European military, and then playing those odds while they are multi-ethnic it's likely to be some white hard ass with a crew cut who does it. For example the real world equivalent of "OMG the evil warlord is terrorizing the villagers" is likely to happen in someplace like Africa, and who are the peacekeeprs likely to take the dude out if the story has a happy ending? I don't have the whole lineup for the joke, but it's similar to the whole Shepard thing but it goes in the opposite criticism direction, sort of saying "that is what an actual hero tends to look like".
There was also the whole "Villain" table which of course was in response to people talking about ethnic villains appearing in so much fantasy. The points it made ultimately got into how whites might have practiced slavery a few hundred years, dark skinned people practiced it for thousands of years through the ancient world, with whites being the major victims. An associated joke was that Hitler and Stalin must have great evil press agents because they seem to get tons of credit as "the most evil" when guys like Pol Pot killed more than both of them combined. The name eludes me but there was supposed to be some Chinese emperor who pretty much had a third of his population put to the sword to stop a plague that didn't exist. The bottom line is that it's racist for us to continue to act like the most evil people on earth are whites when Asia has "us" consistently beat in the mass murder and depravity department. Six million jews, psssh amateur, I think according to the charts especially when you adjust for relative population Hitler didn't even make the top 10.
Describing it lessens the impact, but the point is that it's also pretty ridiculous when you think about it, and generally only really funny even with the grain of truth when your talking to people who already agree with you. Though the idea of all the greatest mass murderers sitting around in hell discussing how evil they are, and Hitler not being able to join their club is kind of funny in a weird way, someone even drew a cartoon of him begging at one point if I remember.
