Literally everything offends someone's sensibilities, there's no exception. In your view everything should be banned. It's people dressing up on a holiday, find a real problem please.
Complaining about these little things undermines actual racism, therefore I deplore such complaining, it offends me. Actual racism, where people are being discriminated against, being physically and mentally hurt, put through anguish etc. This has nothing to do with such things.
The only reason you're offended is because you make an automatic connection with slavery, but that's your problem, there isn't an actual connection.