It's this weird online thing that people make a big deal out of someone blocking someone else. Holding it up as a badge of honour or great victory like "oh, this person blocked me because I said this thing!"
I am in full support of anyone can block anyone else at any point for any reason. No matter how big, or small. It doesn't prove or disprove anything. No one is obligated to engage with anyone. Block freely, and block often.