Well, I can tell that some people posting here have never had a relative classified as mentally handicapped or had a friend with a relative like that. Or maybe you did have a friend like that and did not know it and every time you did your ignorant impression of someone like that, you hurt that friend, and they just held it in. I had a mentally handicapped brother and if anyone at a game ever pulled that garbage, I would warn them and then kick them out if I was the DM and they did not get the message, or if I was a player, I would quit the group if they did not stop, maybe punching them in the nose on the way out.
And on a side note, I did not know that when someone blocks you, for probably stupid reasons, that you can still see threads they create and post in them.