"Republicunt": why use terms like this?

[Aegon]

I could never be someone who believed in bad words. Words don't have magical powers. It's entirely the meaning behind them that matters... and if when you say "retard" you don't mean "mentally disabled person", then you're not insulting the mentally disabled. It's very much like the South Park episode where annoyingly obnoxious motorcyclists are refereed to as "fags" but absolutely nothing to do with homosexuality is intended:

Exactly.  When a southerner displays the confederate flag, black people feeling offended are just being irrational.  The only relevant thing is what the white guy with it painted on his pickup truck intends for it to mean.

What would be a reason to display the Confederate flag that shouldn't be offensive to the people the Confederacy wanted to keep enslaving?