If you are in a public restroom and see a guy with a very bad comb-over talking on the cell phone while using the urinal who then leaves without washing his hands, are allowed to force sterilization or call the cops? At very least I can snatch away the cell phone, toss it in the commode and then give him a swirlie, right?
I don’t think so, regardless of baldness. Although if it’s a restaurant employee, feel free to call the health department. 
(My bolding)
Uh, yeah. If you feel like touching it.
Nah. Just kick him in the butt.
Just ask in passing, “So, <ahem>, you gonna eat lunch with those hands?”
Warning: be ready for an F.U. reply.
It being the comb-over or the cell phone?
Whatever you do, don’t touch the hair. No-one touches Donald Trumps hair.