To be fair, in Florida at least it referred primarily to the whips used to drive cattle, not anything slavery related.

https://en.m.wikipedia.org/wiki/Florida_cracker

Not in many years.

Our idiot principal for my first two years tried to come up with his own rule that shirts had to be tucked in. The written rule added the caveat “if it was designed to be tucked in”. I purposely bought shirts that said they were not intended to be tucked in just so I could be a problem, and then made sure other people know which ones to buy.