Didn’t that YC’er get expelled from the Ycombinator community for harassing other founders with alt-right slurs?

What makes a slur specifically "alt-right"?

Not sure why you're down voted. It's a legitimate question, particularly from many who may not follow US politics very closely.

The alt right popularized particular terms that have racial and misogynistic undertones as insults such as cuck and soy boy.

Thanks. I was imagining the more "traditional" (for lack of a better word) racist and sexist slurs that have been around for a lot longer than the alt-right, but I see what you mean. I wasn't familiar with what was said in the incident being discussed.

Cuck is invented/re-invented by alt-righters.

"As linguist Mark Liberman explained on Language Log, cuck “was extended figuratively on 4chan to reference ‘relinquished manliness’ and more abstractly ‘selling out, abandoning principles.’”"

It wasn't, the word (from cuckold) is hundreds of years old.

https://en.wikipedia.org/wiki/Cuckold#History_of_the_term

{{Citation needed}}

Before edit, comment was originally: "Cuck is invented by alt-righters"

cuckold is an old word (Shakespeare used it) as well as the shortened cuck I've heard both for nearly 40 years and they are much older than that the usage hasn't even really changed it has always meant an effeminate, weak, or inadequate man don't be a cuck was an insult 30+ years ago.