(These are mostly complaints about my co-workers, but you guys/ladies can apply it accordingly.)
If your risotto sits upright in a ring mold, your risotto sucks.
And if your pasta is falling apart as you're plating it, that means it's overcooked (read: disgusting).
If you can see your reflection in the lettuce, you're over-dressing the salads. Stop it. And stop breaking the burrata, too.
Okay folks, let it out. Don't hold back. What really ticks you off when you see somebody cooking something you know is wrong (to your own personal standards or everyone in the culinary world).