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Really late response, I work as a cashier deal with them all the time, I lay it on extra thick and play super slow and see if I can short circuit something. 99pct of the time it works, they may snap, just as a warning. This doesn't work if they know you or assume any competence, in that case being super curt and tuning them out when they speak works great.
Back in the 90s some nazi groups invested 10k in internet propaganda, I figure the internet being so fascistic is just the results of that along with nerds being all sorts of fascistic is just a product of western academia culture to an extent as well.