I have been blocked how many people have blocked you.
Most Helpful Girl
Most Helpful Guy
I've been blocked twice. Both times for just saying something the person didn't want to hear in a polite, articulate and soundly reasoned way. I suspect that is what disturbed and angered them about my comments. You can dismiss someone who disagrees with you more easily and calmly if they don't make a good, respectful argument.
I'd never consider blocking someone, even if they were rude.1