No, it doesn't get "dangerous". I was called those things, and worse, on this very forum, by LONGTABBER, tsig and others, but I withstood it and came back with a renewed perspective and an adjusted attitude. Makaya, you've also been called "delusional", "incompetent" and even "stupid", and so has SweatyYeti, VisionfromFeeling, and others who have received even worse treatment. None of them has proved "dangerous" by any reasonable definition of the word. Like me, you've reexamined your position and declared your change of mind. I say this is all to the good, and we have ridicule, in part, to thank for that improvement.
There is nothing "dangerous" about using words to express one's opinion about another person's lack of intelligence/insight/technical skill/whatever. "Sticks and stones" and all that.
It also doesn't matter if anyone thinks it's funny or not. Kitakaze has stated that the Kiwi humorist does not tickle his funny bone... well, so what? The guy is ridiculing people who are arguably ridiculous, satirizing people who are ripe for satire. His approach may not make you, personally laugh, but that's okay. He should still have free reign to do what he's doing. It's also okay if other people do laugh, because that's all he's doing: making himself and others laugh at the silly, unsupported and unscientific beliefs, and the arguably absurd lifestyle, of a certain group of people.
We've all got it coming in some form or another. We're all ripe for ridicule. Let's not pretend that by poking fun at some people and making them look dumb, this humorist did anything morally or ethically or legally reprehensible. He's having a laugh, and I'm laughing with him.