Misuse of the word 'on'...

[lovelyjubilly]

Aibu to detest the way that the word 'on' is suddenly misused in so many contexts?

Just two examples:

"I do it on a morning."
NO! I thinking you mean in the morning'.

"What do you think on my shirt?"
NO! What do I think about your shirt?

Rant over.

Aibu?

Sirzy. I thought exactly the same thing about that NHS advert! Glad it's not just me.

There's a sign on the wall of the communal hallway where I live that says 'It is against the law to smoke in the premises' communal areas'. Surely it should be 'on the premises' communal areas'?

Surely it should be 'on the premises' communal areas'?
In the communal areas of the premises would probably be better.