Please don't be oversensitive & get, "triggered", when I say this because I don't know of another way to put this into words. With that said, here we go.
It's a meme! A joke! Taking facts & exaggerating them for comedic purposes. One of the most common, but no less effective, means of making people laugh, or at the very least crack a FRIGGING smile. I know that there are people in the world who will "lose their mind" if they hear or see someone say "F**K WHITE PEOPLE!" This meme though is meant to call out the massive bullshit, double standard, hypocritical, backwards thinking, Special Snowflake, SJW, ironically "Progressive", NPC, Alt-Left rhetoric & beliefs by making fun of how people on social media, mainstream media, cinema & TV can casually be hateful, discriminatory & racist to whites and say that it's okay (and for the most part get away with it), but it is NOT okay if someone says the exact same hateful, discriminatory & racist things that they, the Alt-Left, just said (and say most, if not every, waking moment of their "Progressive" lives) except for one slight difference, you change the race that you are being hateful, discriminatory & racist towards from white to non-white. Keep in mind that at the same time, they'll say that blacks, and to a lesser extent non-whites in general (if not all non-whites), cannot be racist for [insert mental gymnastics here].
In the end, racism & discrimination is not okay & shouldn't be encouraged nor tolerated in society regardless of which race or group is being hateful or hated.