There was a time someone came to hate on one of the series that I draw for. We were announcing that we were going on a small vacation of two months for the Holidays and then we'll be back.
This person started as "Don't come back" and eventually escalated and insulted the author of the series and constantly claimed that they were a better writer and stuff like that, lots of insults about the characters, the fact that is a romantic/supernatural story and that I was wasting my time drawing for it, basically:
They were throwing hate because they considered unfair that a "crappy author" was getting a decent artist for their series and they didn't, funny thing, when I told them I was getting paid to work for the series and gave them my prices they began to evade the topic while just claiming that "it was going to look awful on my portfolio"