> teaches impressionable young coders (the college kids that typically have time to write sarcastic open-source one-off projects) that this kind of thing is okay.

Teaching that what, exactly is ok? Using the word "bruh"? In all seriousness, how old are you?

Plenty of people use that word, and it's not just guys. Is it on the immature side? Yes, but it's not really condoning whatever behavior. Unless you have data backing that assertion, you are just projecting from a mere readme file.