IF there's any hostility, it's directed at people and acts that are seen as inconsistent: You point to the rule that says "Please don't post on HN to ask or tell us something ... If you want to say something to us, please send it to info@ycombinator.com. " after you made a post telling them that the site is having issues.
"More, I figured that most of the other times something goes wrong at least someone posts to HN asking, and no one had done so."
That's not an excuse for you to do something which, as you pointed out, violates a rule.
"I was half hoping to head off the usual flood of posts that something was wrong and let there be just the one place,"
Incidentally there is one place that did head off the usual flood of posts: https://news.ycombinator.com/item?id=5650171 Are you complaining that it wasn't your post that was the one place?