I just walk off. If anyone follows me through the mall screaming at me (which has happened, at the very same mall listed here!) I immediately go complain to mall management..... who do nothing, because apparently a gimmick kiosk selling $2 bottles of goo for $100 pays them a lot of rent.

One mall I went to in semi-rural Ohio had it right -- the kiosks had little boxes taped on the floor around each kiosk, and the hucksters weren't allowed to leave their box. It was easy to go to a mall to shop, not to be yelled at like some kind of third-world bazaar.