But…
How exactly is this NOT racist?
It’s not necessary a “white” person, for example I once had a discussion with a black American who took this position depicted here, a big Obama fan and free market defender
It’s interesting how vilifying an entire group of people based on the skin color is not considered racist if that skin color is white.
Historically “racist” is the bunk pseudoscience that claimed white people are more intelligent than other racial groups. When you refer to someone in the modern age as racist you are comparing them to those idiots. It wouldn’t make a lot of sense to compare somebody to that group for disliking white people.
To answer the deeper question you’re hinting at, although the post is racially predigest, making fun of white people for being white is generally considered punching up which is not frowned on in the same way as punching down.
“Whites,” have Cultural Hegemony.
The meme is a critique of those at the top of the dominant social hierarchy. To question the legitimacy of the critique is acquiescence to that hierarchy. Robin DiAngelo explains it better.