Yes, the title is deliberate - sorry to have been clickbaity.
Expecting to be flamed although am trying not to be offensive, but this has been bugging me. Can anyone suggest why certain otherwise apparently well-educated people make up their own grammar rules?
I'm thinking of things (all of which I've seen "committed" by numerous people) such as deciding "thank you" should be hyphenated, or separating sentences or clauses with ellipses rather than a comma/semicolon/full stop, or leaving a space before exclamation and question marks, etc. (there are probably others).
I'm not having a pop at anyone who is dyslexic, or didn't have access to a decent education or who is writing in a very relaxed way because the context is informal. More trying to understand why some people seem to follow their own special set of grammar and punctuation rules which are consistent, but wrong.
I see punctuation as a way of getting across the inflections that you can hear in speech, so I don't know why you would want to fuck about with that and make your meaning unclear in the process.
(And apologies that this isn't in Pedants' Corner, but there's hardly any traffic there.)