HAH, you probably got your name or account shared in a list of "bad dudes to avoid online".
This is a thing in a lot of sites like art (deviantart) or social (tumblr).
Where a crybaby (someone who takes offense for not getting their posts praised or filled with yes-men) will make a list full of fake excuses (like "this guy insulted me, racist, misogynist, trans-phobic, antigay, toxic, etc.." and then they shove the list to everyone (specially their close circle of yes-men. and start spreading around, duplicating the "offenses" and making your mere presence worse than Stalin.)
I've seen that behavior a lot. and Its always pushed by some immature boy (or a young "feminist" girl in their 20's)
So, if you end being blocked by someone who you never seen and you just notice. That probably happened.