I had to put this stuff into practice today. I didn't need to be obnoxious, rude, or try to be anything more than subtle. That wasn't the time nor the place. I also knew I didn't want to be part of their negative spiral, so I simply introduced myself as soon as there was a lull in their conversation. That put an end to the discussion. It wasn't my role to try and change them, but that didn't mean I needed to be complicit in their negativity by not speaking up in a sense. I found a way to do that subtly while not burning any bridges with my actions.