Don't discount random chance plus miscommunication plus priming.

You've been downvoted quite often recently when making a post that says "I espouse a 9/11 conspiracy theory, here is my evidence and argument". I think we both know why that is, whether or not it's "justified".

On this top-level comment, regardless of what you thought you were saying by "I'm not going to read all of your post, but", it's very plausible you communicated "I'm going to pull a typical internet-poster and not read what you have to say, now you listen to me:" to a reader. A single initial downvote makes it far more likely the next reader will interpret your statement in a negative light as well. etc etc