Why is the fact that someone is white mentioned so randomly on the internet?

And only on the english internet from what i've seen, i've seen a woman say "rich white men" but it was about the free the niples thing, and i think just saying men would be enough.

other times i will see someone being descibred as white for no reason, like pick a public figure doing something like making memes, some will say, "white billionaire making memes" or something similar, why does this happen?

Note:I am NOT claiming this is racism against white people, i am just curious