Why do people comment on the post that makes them block you and then block you straight away?

You cant see what they said to you before they blocked you and is a waste of their time.

Case in point someone just blocked me for answering their question seriously not knowing it was a joke post, they told me to not be annoying, I joke that I like to be annoying, she replies but I can't read it as I'm blocked.

Dont get me wrong I'm not bothered that she blocked me, just annoyed I couldn't see her response, its like getting to the end of a book to find pages missing. Maybe I should take this as a lesson to look at my notifications quicker lol