From graduate students and postdocs in the chemical sciences
You don't give proper credit You do not acknowledge others that have helped you or you steal ideas
You hoard lab equipment/space You use hours of instrumentation (e.g., NMR) time and are greedy with lab supplies.
You are rude You don't respect people's thoughts or space.
You are a mess You leave bench tops, waste, glassware, and instrumentation (e.g., HPLC, NMR, MassSpec etc.) a mess.
You are arrogant You condesend to those (i.e. undergrads, graduate students etc.) you are supposed to mentor.
You are obsequious and insincere You are only nice to professors or people you want something from.