SLF here. I was recently sitting next to a guy who tried to eat his moist towelette out in the Middle East. Quickly spat it out, into his sick bag. This was plane full of migrant workers routing Dxb-Doha on their way home, very inexperienced air travellers. Totally different crew behaviour shown towards Europeans/migrant workers. I don't know if I would call it racism. It was certainly pragmatic.