Users flagged it. We can only guess why users flag things. In this case I think they probably just thought your comment was flamebait—any time a comment is (a) too short to contain much information and (b) the topic is controversial, you're going to get that interpretation. I've turned off the flags now.
While I have you, would you mind reviewing the site guidelines at https://news.ycombinator.com/newsguidelines.html? Among other things, they ask you not to post questions like this in the threads, but rather to ask us at hn@ycombinator.com. There are a bunch of reasons for that; one is that we're only likely to see your question if you email it to us; and another is that posts like this take discussions off topic.
While I have you, would you mind reviewing the site guidelines at https://news.ycombinator.com/newsguidelines.html? Among other things, they ask you not to post questions like this in the threads, but rather to ask us at hn@ycombinator.com. There are a bunch of reasons for that; one is that we're only likely to see your question if you email it to us; and another is that posts like this take discussions off topic.