Although if you actually never tweet or retweet at all it’s hard to know how he would even know you exist.
Exactly. Plus I don't even follow him. I agree with him about blocking people you disagree with etc. and it's not a 'gotcha!' when people go on about free speech. Blocking someone on Twitter is not the same as deplatforming or cancelling.
I just don't understand why he's blocked me in particular. If he ever popped up on my feed, it was because an account I followed had retweeted him and I usually agreed with what he said. I don't understand why he'd go to the the bother of doing it.