Mexico is not discriminated at all in South America. A good deal of it probably comes from the fact that Mexico is not in South America: Brazil, Argentina, Chile, Paraguay, Colombia and others are. But not Mexico. Nor Canada (just so somebody actually talks about Canada, lol).
As for this “Latin” stuff, this seems more of a US thing in the sense that’s actually an euphemism for Angle-Saxon (but sometimes, also Slavic). Anyone of Portugal, France, Spain and Italy ascendancy should be Latin, but no-one there gives a shit about it. Well, some idiots actually do and are proud of it, but whatever. As for the skin tone from some Mexicans, this comes from the Indians. In some countries, they haven’t been mostly annihilated like they were in USA, Argentina and Brazil. You see many people with similar tone in Paraguay, for instance.
I find it hard to generalize about arcade operators not only around South America, but the whole Western world, one aspect aside: incompetence. The vast majority of them had no real idea of the business they were running. To them, the machines were no different than coffee machines or any other device that you plug in, leave it running and have people occasionally drop money in there, which you collect at the end of the day or the week. The clients themselves were an inconvenience, specially if, heaven forbid, they actually got to be good at a game. These infamous kids or young adults would fucking lock the machine for quite some time, preventing other players from leaving quarters and quarters there, and that was what mattered. To reduce the inconvenience of actually having people inside the arcade saloon, they never opened toilets for them. I have never seen, in my country and in my travels to Argentina, plus a travel to Uruguay, a single arcade saloon that would allow you to take a piss: you had to go home, or maybe find some store nearby. At only one of them you could buy something to drink, and would want get tired and want to seat, you basically had to find a vacant car game cab. I was only asked once about which games they should get. The many times I asked about incoming games, most times I heard that “those were the games the retailer sent them.” Many times popular games were suddenly replaced. That probably killed HF, ST, SamSho and others in arcades more than anything: people went on vacation, and when they got back, cabs were gone, no questions asked. At the place I go to during summer, the “operator” (who’s actually a friend of mine) had absolutely no control of the games which were sent. Operators blame consoles, people getting old, prices and many things, but most of them never took the time to think of how they could manage their business in the long run.