Do NOT touch their dishes...let their dishes pile up  This. And if they ask you why you aren't doing the dishes or why you bring your own stuff, just say something like "I really hate doing dishes. It's so much work! You know how it  57e7   is... It's just easier for me to bring paper plates. I know it's not good for the environment and stuff, but neither is hot water and soap, and it gives me more Me Time on my break, teehee." Best case scenario, they think you're some smart cookie (mmm cookie) and start bringing their own so they stop smelling up the sink with their dishes (Sadly they will continue to smell up the office with their unwashed orifices) Even if they don't, you still get to subtly shitlord them.