@ramsey For anyone who hasn't experienced anything even close to it: good for you; that doesn't change what happened to me. You can continue not blockig prople, or providing them with polite explanations as to why you block them, and you can continue thinking that to do otherwise is rude. Just don't harass people for an explanation. You aren't entitled to it.
@ramsey Oh there was also another guy who didn't like the manner in which I shared my knowledge, so he went to harass me on every social media as he got blocked, then actually attended an event I was speaking at abroad and tried to approach me. Luckily I let my friends know in advance that the asshole lived in Berlin. They got up from the couch and he ran off. It's insane to me when someone tells me I need to be more polite to such people. This is not an isolated incident.