The belief that race accounts for differences in human character or ability and that a particular race is superior to others.
Discrimination or prejudice based on race.
The belief that each race has distinct and intrinsic attributes.
I know it's just a dumb meme but how do you think racism starts? My experience is it tends to begin as "just a joke" until it's normalised enough that someone feels comfortable enough to take off the mask and either encourage or perform discrimination and/or violence.
Why tolerate white racism when we don't tolerate any other kinds?