How about it's just in poor taste to use it and its use probably says more about the user than the target?
And, if you use it, just be prepared for someone to take exception to you using it and you might just trigger yourself an ass beating or some other adverse consequence. Kind of like playing with fire crackers or bullet ants. Maybe, just maybe, you can find a better way to insult someone that's a little more clever and incisive and makes you look like less of an ignorant asshole.