I've found the best way to avoid them is to wear a suit and to constantly look at your smartphone like you're an executive who's aggravated with a business prob

I've found the best way to avoid them is to wear a suit and to constantly look at your smartphone like you're an executive who's aggravated with a business problem. If they question you give terse responses with a hint of being annoyed but without being rude. Or even be a little rude but apologize highlighting how you're dealing with a problem at work. They tend to move on.