You got flagged off for this, probably because of the thinly veiled insult, but I'd agree that there's nothing wrong with signaling that you'd rather not work with people with a deficiency of sense of humor.

If "wat", "bruh" and "performance gainzzz" (of all things.. we're not talking about slurs here) in a readme actually gets people to self select out of using an update checker, I find it very hard to see that as anything other than a positive for people who want to work, rather than debate sociology.

...not that I think that was an intentional goal of the author.