I used to, but not anymore. I had a roid raging, small man syndrome freak tell me he was going to kill me. He was as wide across the shoulders as he was tall. He said it in a calm, cool manner while looking me directly in the eyes. That one gave me pause.
Before that, another guy went well out of his way to chase me down in his SUV and pull rediculously illegal road manouvers to try and run me down. All because I yelled at him for pulling a right hook on me. He almost ran me down, so I gave him **** for it.
These days, I bite my tongue. I'm not a small guy or anything (190 pounds, six feet tall) and I've been told I look mean, but people are friggin nuts these days. It ain't worth it, you never know who's got a gun. I'll just say something under my breath to myself and continue on my merry way. Discretion is the better part of valour, after all. I gots kids that need their daddy alive.
Be careful everyone, its nutty out there.