You start to disrespect. Either on opinions, tastes, personal work or anything related. If you don't show respect, you won't get it in return.

You don't like my work and anything related. Do not spread hate and fake/unfounded info, just ignore and leave without following, or just unfollow without preteding.

You're blatantly not interested in my work, or you are might in addition just gathering info and concepts for yourself or for someone else's will.

You act racist, rude, stalker-ish, envious and tend to insult and/or manipulate. Mostly, if you would also flip the story on purpose/mirror your own bad and victimism behavior on the other person when you're wrong.

You force or fake friendship.

You do footlicking and act nice to take advantage.

You have the intention to art-dig.

You want to copy, without asking permission nor crediting, and/or trace to then claim the work as yours. Be inspired and let the artist know it.

You're someone who doesn't either admit the use/credit bases, nor any other inspiration source.

You gatekeep/claim a character or a ship [either ccxcc and ocxcc], trying also on purpose to make the other person feel miserable. Such behavior would result toxic, disrespectful and uneasy, as I personally am comfortable (as long as there's reciprocal respect) on ships with the same character as mine.

There's big hypocrisy and incoherence in your behavior.

You tend to act out of spite, mostly when the other person never did anything against you.

You tend to rush the work if you may ask for a commission or art trade. Art takes time and we all have our private life. So, please be patient. I never forgot anyone's piece as art did become my full-time freelance job.