Anything beyond the subtle snubs and eye movements and basic judgements flies in the face of a superstitious understanding of the mystic arts in Zalanthas. The Common Wo/Man believes that a Gemmed can look at them funny and cause them to lose a child, or give them impotence, or make their mate fall in love with someone else. We have to keep in mind as players that Magick doesn't begin and end with a spell list -- There is a virtual 'Magic' that is psychedelic, beyond mortal ken and understanding, and isn't 'coded'. Magic, to those who cannot cast it or understand it, believe a magicker is capable of anything.
The idea of a Common Wo/Man picking a fight with a Gemmed or calling them out in some macho way is...Stupid. Wanting them dead? Sure. Thinking it all to yourself? Sure. Not going out of your way to help a Gemmed that got shivved in the street at dusk? Not a problem. Taking your time to help a Gemmed who's apartment got broken into? Makes sense. Suddenly running out of that trade good a Gemmed is interested in? Happens all the time. Unable to find a Gemmed's order, even though it's in the warehouse? Things get misplaced.
The more we move away from the fart joke macho teenager mentality in the Gaj, and further into the subtle discrimination, the better.