It's how anti-peevists introduced NFL and baseball instead of football and cricket. And *********ization rather than *********isation.
"Silly" to mean "you haven't got a leg to stand on and you should seek professional remedies" is just a variant.
Silly, to mean, somebody who uses "silly" in that way is rational enough; with the exception of it's use as a simple rhetorical device when addressing an audience of gumps. Then it's only silly if it doesn't make money.
I think assertivitis is a natural condition exacerbated by the internet. It becomes a habit in a small, obviously gumpy, social circle, along the lines Evelyn Waugh and Aldous Huxley described, and then it is brought forth on an international debate forum as if such a zone has nothing better to offer than what the neighbourhood of the victim has.
A pip expanding to a mountain with a flick of the wrist. The nouveau riche
are particularly susceptible to the condition.