This particular pet peeve saddens me more than actually being annoying.
Partners who dropped out from my 1x1 RPs with them without any warning whatsoever, just straight up... poofy doofy. :( From this, the event usually progresses to either these variations:
1. The player is suddenly not active anymore on the forums for whatever reason. This I can understand, life can be a bitch or they're not interested in RP-ing anymore, I wish them luck in whatever difficulties they might have, still... a warning beforehand or farewells would've been nice.
2. The player stopped replying to my thread with them, but is still active on their other threads and forums, I usually understand if they are having a writer's block for our plot and wanted to take their time while replying to other threads, but when it goes on and on and on for a month or two, then I will start raising eyebrows. Of course, I don't want to assume so I ask them questions regarding our RP. Sometimes, they told me they are not interested anymore but afraid to tell me because it might offend me. Some other time, they genuinely forgot about the thread because they didn't watch/subscribe the thread. We usually work this out, no one is perfect, you and I both, I very much understand this. However...
3. This happens rarely, but they do happen. When they dropped off from the RP, still active on other threads, and straight up ignoring me when I politely ask them for concerns or feedback, then I will start frowning as my heart cracks. Still, I usually try again to get them to talk since I care about the thread we're working together, I respect our efforts in the plot and I don't want to see it rot. A few times, those people kept ignoring me... oh well, alright, I'd have to move on, but there's this one time when an RP-er told me they are offended and hate me, me as in the guy behind the computer, the writer, for something my fictional character did to their character. Dude.... what the ef? Come on... :(
To make matters even more perplexing, I was playing a female teen with psychic powers and that guy was playing a young adult boxer, the latter tried to rape (IC-ly of course) the former, and you wonder why my character ended up despising and wanting to kill yours??? Dude, YC tried to rape MC, of course MC would hate you will all her being and being someone with power to actually fight back (in this case, telekinesis), obviously she'll do exactly that. What do you expect? That she'll end up not harboring any grudge, even falling in love with him? Shiiieeet, Stockholm Syndrome doesn't work that fast.
I wasn't angered, nor furious, I was... sad. In every single one of my RP, what is most important to me is mutual enjoyment of both myself and my partners, if I can't achieve that, then I won't bother RP-ing at all. It saddens me everytime to drop an RP, but well, life goes on. It is something I must deal with, but please... please don't do this to me.
There, thank you, Iwaku for providing me with a place to vent.