Have you ever been intentionally rude to someone?

I can't help but notice that people seem to be getting less tolerant and more rude these days. I can't lie and say I haven't been, but it takes instigating to get me going. So, I'm curious: are you ever intentionally rude? Why or what does it take to get you to be, if anything?
Have you ever been intentionally rude to someone?
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