I'd argue that weird isn't being used as an insult, but to state that the bullies are in fact not representing the norm. They are outside the norm but pretend to be normal, they insist on being normal - which makes it weird. It's not an insult to us, but it is an insult to them. Which makes it funny.

Fascists believe in inequality based on identity, while we kinda thought we had this already sorted that we all believe in equality now. Like all people created equal. But their need to define an identity as superior and then attacking anybody outside the norm is being used against them. And it IS weird to do that, most people simply don't care if you're a little weird. We still have to learn to be more tolerant to more weirdness and not react with biases or irrational emotions. Respect weirdness.

So weird isn't being used as an insult but as a way to rob them of their power - their attempt to define a new normal. And their arguments and attacks against anyone else are becoming increasingly bizarre, less founded in reality, absurd claims. Comical. Weird.

There is the metaphor about slowly cooking a frog without him noticing, shifting the overton window. Weird sort of resets that. It is more an attack on what they DO than what they are.