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It's taboo to criticise such movements because by extension you criticise those that actually have the illness. And some movements have grown quite powerful politically. If you allude that it's problematic to let children change sex, you are painted as anti lgbtixxxx. Activism has won against science.
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I don't know if it's "impolite" but I do know that you can't troll HN like this. We've banned the account.
If you don't want to be banned, you're welcome to email hn@ycombinator.com and give us reason to believe that you'll follow the rules in the future. They're here: https://news.ycombinator.com/newsguidelines.html.