Honestly, you can get them for anything. My partner got multiple death threats for a post she made about soda one time. My best friend got tens of them for making a joke post on reddit about being able to fight a blackbear. Granted the common denominator for both of these was Reddit so maybe it's just that.

I got them twice in reddit. One was some wildly racist whackjob who really got off on calling me stuff while making up some weird story about who I was in his head. Report and block and move on. Another was a Freemason candidate who was SUPER upset after he acted like a douche and got called on it by his own people. He blamed me for his actions. Lots of people will blame other folks for their own actions.

Minorities...