For what you've described, I agree: if you write a post, get downvotes, and then add an edit wondering about the downvotes because you're genuine about your position and are looking to engage, people tend to start engaging in kind and upvote you at least to neutral.

But I think the parent is talking about the habit of many who are about to post a counter-groupthink or controversial opinion to lead off with "I know I'm going to get downvoted for this, but...". My feeling there is that people generally view that as a sort of flippant disregard/dismissal of the community moderation process, so it basically _invites_ downvotes.