Going around town on the bike and coming across a scooter is bad enough as they are constantly trying to race you so you end up putting your foot down (should be twisting the throttle) and leaving them behind and breaking a few rules yourself.
If they nod & behave I acknowledge & have been known to even smile. If they are being a**holes, I kinda try & ignore them, like they are dust beneath my wheels and not worthy of notice and just ride normally. 8-) 8-)