This may seem kind of stupid but I am kind of stupid, is there a list somewhere of phrases that are stupid or insensitive racially or gender biased?

I just got up from conversation with a couple of older black men, that I said "well I got to go back to work and start cracking the whip." And it occurred to me then that it was probably a really insensitive stupid thing to say.

Sadly, it hadn't occurred to me until it's already said.