Any place’s rules and bike infrastructure vary. I say that if they use bike infrastructure or shared multiuse pathways while being respectful, i.e. travelling at less than 32km/h (20 mph) (and less than 20km/h or 12.5 mph around pedestrians) then I have no problem. What kind of helmet and what the bike looks like, or if it’s a motorized scooter or jet powered wheelchair or whatever that doesn’t matter to me personally.
More likely you’re encountering someone going at the posted road speed above 40km/h (25 mph) and using the bike lanes as a shortcut. Feel free to chew those people out.