Why someone blocked me, and I didn't do nothing
Maybe it was your grammar ;)
That's a question to ask the person who blocked you....
they are a grammar nazi?
?<-------there's the question mark you forgot.
Are you sure you didn't do nothing?
They didn't like you?
Well, "didn't do nothing" is a double negative which implies you did do something.
Ask the person who blocked you©
I wouldn't know. Maybe they think you're annoying... :/