I haven't encountered a rage quitter in a while, but that may be because I've been pretty inactive as far as online multiplayer goes.
The latest one I think was against a Mitsuru player in Persona 4 Arena. The dude had a decent amount of matches under his belt, and a 90%+ win rate. I didn't expect it, but he was awful. It was as if all he knew to do is spam 5A into the autocombo. He wasn't thinking at all. His play was completely mindless. He wasn't playing the Mitsuru-Labrys match up, and never adapted to my strategy. I don't even think he exhibited any semblance of general fighting game fundamentals, like spacing, from him. As incredibly good as Mitsuru is, I have no idea how he could win against anyone. He probably boosted with his friend or something. Anyway, I beat this fraud. He rage quit after a good amount of time into the final round.
The latest one I think was against a Mitsuru player in Persona 4 Arena. The dude had a decent amount of matches under his belt, and a 90%+ win rate. I didn't expect it, but he was awful. It was as if all he knew to do is spam 5A into the autocombo. He wasn't thinking at all. His play was completely mindless. He wasn't playing the Mitsuru-Labrys match up, and never adapted to my strategy. I don't even think he exhibited any semblance of general fighting game fundamentals, like spacing, from him. As incredibly good as Mitsuru is, I have no idea how he could win against anyone. He probably boosted with his friend or something. Anyway, I beat this fraud. He rage quit after a good amount of time into the final round.