Highly likely Jews started spreading jokes about blondes among White people, right after National Socialist ideological portray of the blonde ubermensch. It's annoying when clueless Whites keep repeating these jokes about their own kind that are mindless.
So what are you going to do? Argue with a low-level employee who hates his job, or do nothing? Talking with a local manager is better than nothing, but still too low level to be relevant.
If anything, it's a display of a dysfunctional corporate structures that intentionally isolate their decision makers from criticism of customers.