My biggest peeve is under- and over-exposure, especially under.
Most of the basic editors can easily correct it to bring a shot to a viewable
state of recognition, but many don't seem to care or give consideration
to how others may see a picture.
This doesn't come up much in photography-centric places like here,
but on the intarwebz in general, it's a voodoo chicken of complacency
that says 'I just wanna post it and I know what it is and I LOVE IT,
so if you don't see it then it's not for you so you can just go away, m'kay?'
So, I just say to myself, 'M'kay, I'ma gonna move out. You failed.'