Two. One kept sending me a variation of the same message over the course of a few months despite me telling him I was not interested. The other kept sending me messages, and just seemed too desperate and creepy.
First off, is there a difference between "block" and "ignore"? I really don't know....
To answer the question, 4. All because they have big mouths, slow brains, or are just so focused on their own opinions they can't possibly see someone else's may have validity.