I've honestly never known anywhere or any group of people who feel that it's reasonable to 'toilet-shame' people.
Unless someone is avoiding something by doing it, which I can honestly say I never do deliberately, it's nobody else's business (ha!), how someone chooses to empty their bowels - have a wee, shower, bathe, dress or brush their teeth - as long as someone gets the job done wgaf?
As for the "why don't you get off and then go back for the second one", good flipping grief, why the hell would someone wipe twice, flush twice, wash hands twice, dry hands twice rather than just wait a few minutes - and who the hell are you to judge anyone for what they decide? It's the flipping toilet, it is literally no-one else's business than the person doing it.
Again, if someone's doing it to avoid jobs, or they time it so people can't use the bathroom then you've got a complaint, otherwise keep your judgement for something that deserves it.