Your instincts are wrong. HN has been a safe place as far as I've ever known (imo you're modded for being unreasonable or irrelevant here - even dumb is fine), but it's not safe to assume that you can say things bluntly in any forum just because they're true and said in good faith. It may read as bravery, but it's really just hubris. They'll delete you and tell other people to delete you. They'll report you to police. They'll ask your friends and family members why they're bad people for not shunning you.
Magical incantations and bad words are also the easiest things to avoid while still being very aggressive. Adhering to arbitrary pieties in form is actually a nice shield against people who are allergic to substance.
