i'm a white english guy - most of my first employers were old white english guys, several of them underpaid me and two didn't pay me for multiple days work. I usually bring this up when racist white brits throw around their prejudices about other nationalities.

However, I once worked for a small moldovan-owned company. the boss paid me less than the minimum wage, put me in dangerous situations, and was generally disrespectful. Two other moldovans later told me they would never work for another moldovan (;_;)

A nigerian friend stopped me from messaging a west african guy selling a van on fb marketplace. He saw the guy's name and put his hand on my phone and said "don't be stupid bro".

I don't think this is racism, but it's something.