I am very frequently on transport and maskless for the whole time, I'm maskless when I get on, during and when I get off.
There's 3 types:
A) The majority of bus drivers say nothing at all - they'd be the ones looking to get through their day with the minimum of fuss.
B) Maybe 1/4 to 1/3rd say "sir, mask", I say "ok, in my bag" and sit mostly out of view, maskless. Nothing further occurs - They're also the ones just looking to get through their day with the minimum of fuss.
C) A small percentage, 10% or less i guess, make it into a big issue - they're not the people you describe, they're the exception. They can easily do what the B's do and then get on with their day having asked me to wear.
As you can imagine, I have no sympathy for the C's, it's only the C's that make it into my 'mask reports on Geo.
But as I've written repeatedly, the vast majority of ALL people in HK simply don't care enough to raise the issue.
Anyone who takes the same approach as me will come to this realisation very quickly.