One pet peeve I have is when a creator uses someone else's accomplishments to turn their lives into a pity party. I mainly saw this when I started college and we were all building portfolios.
What I mean by this is: an artist does a project that they're happy with, so they post it online or show their friends at school as they normally would. I've seen and experienced instances where someone will turn the whole situation around to be about them. They'll say stuff like "too bad ill never be able to do that" or "hahaha, you're so lucky to have enough talent to do that, and then there's just me." So then the artist feels guilty even though it was never their intention to make someone feel bad about their own skills.
I personally believe everyone is capable of improving their work and it's frustrating when, instead of trying to improve, they make other artists feel bad with self-pitying attitudes.