Hacker News does the same, incidentally:
https://news.ycombinator.com/item?id=6060954
I always found that weird about the American system. "Free speech" on the one hand, and yet extreme reactions to political opinions everywhere. You regularly find Americans who publicly declare that they won't work with people with particular opinions. It switches which side is the one overtly silencing the other, which is also weird. When I was a teenager, it was definitely republicans silencing people, and yet today, not so much.
Very weird.