In the RP community I perused before this one, that was called "teleposing." I was accused of doing it, and I didn't realize it was so annoying until someone did it to me, but it has both benign and malignant faces.
The beauty of the "teleposed" insult is that if you call it out and attempt to confront it, they accuse you of metagaming, since you're getting fussy over an internalized thought within the character, not an external action or dialogue which can be construed by your avatar. But in theory there's a line to be drawn between, "My character does not like his character, or the position they're in together," and, "I'm frustrated with something this player just did so I'm gonna take it out on him by having my character think his sucks. Gee, don't you feel shitty now?" This line is blurred easily among people in whom the broader IC/OOC boundary, too, is blurred; the people who roleplay as prettier, more talented versions of themselves, Mary Sues and the like, who will take offense to critique of their characters because in essence you're critiquing them personally. Then the people who take writing seriously enough to care about what they produce, but not seriously enough to receive and accept criticism, whether from the player or the character, because they know what they're doing with their own intellectual property, and outside opinions will be wrong no matter what, and they're the serious deep artist who knows more about writing than you do.
But then, sometimes a cigar is a cigar, and sometimes it's just an IC conflict which needs to evolve organically.
So even though it felt shitty to glare through what were obvious OOC grudges materializing as IC contempt, which I view as blatant metagaming, it's a tricky situation to actually resolve. I for one know that I was just roleplaying an asshole character who kept his insulting thoughts to himself, not a mouthpiece for contempt toward the other roleplaying party.
