It's the same on HN. If you say something controversial with a conclusion people dislike but debatable it will be disproven then downvoted. If the undesirable comment can be greyed out or the writer discredited they'll allow the comment to stand, smugly declaring a public victory.

However if it can't be disproven and you actually convince some people, it will be flagged. And maybe even some people stalk your account and bait you into getting frustrated and then getting your account nuked.

This is why 4chan etc are more intellectually honest imo as you can't nearly as easily censor or rule ban someone who makes a vile but persuasive argument.