Fine tuners and locking nuts on a Floyd Rose guitar, an NFT Floyd and locking tuners stays in tune just as well. Plus they are more comfortable to rest your hand
Most time based guitar effects, except delay and reverb, but only on recordings
King of Tone, Klons and Klones
Telecasters
Pedal boards
The positions 2 and 4 on a Strat
The neck pickup on a Strat
Thinking an expensive part is better than a cheaper part just because of the price tag
Sounding like the record
Excessively relying on CAGED, and any other get rich quick guitar schemes
I hate pedal boards
Using a goatee to hide the fact they can't grow a beard
Using guitar electronics as a crutch so they don't have to learn how to sculpt their tone with technique.
People that think I care how they use/don't use/apply music theory
People that think guitar is an inherently expensive hobby
People that group people into little mental pens such as "guitar players"