This reminds me of a white boy I use to work with that told some coworkers a joke before I started working there and told it for 6 months before one of the white people set his azz straight.
He told them one Monday at break that he hates Monday's because Monday's are lazy, on wellfare, loud, etc etc, various black steriotypes, then he ended with, I hate Monday's. A few white people laughed but what they didn't know was one of the new white people had a black husband, hmmmm. She never forgot that and kept her private life private. I came along and every Monday at break this fucker would make it a point to say he hates Monday's without all the other stuff of course and they would look funny. I'd act like I didn't notice it but I did. Eventually this white woman said on a Monday when he'd make his comment. I love Monday's cause I've been married to one for the last 28 years. It's coming to work on Monday's and having to work with assholes that makes it hard. At that point he turned beak red and white folks at the table fell out laughing. Of course after break she let me in on the joke. Needless to say I never talked to that fucker much anymore after that and since he wasn't in my depart it was no biggie. Long story short she outed his ass. So when them mathafucka's say they hate Monday's tell them you love Monday's and keep it rolling.

I hate mayo too but it has nothing to do with the color. The shit is fattening and mustard is better for you and there's all types of mustard with varying flavors.