To start...I like Hunters the most from a gameplay perspective. Preference. I think the rivalry solidified itself during the times of cheering the Templar and Atheon cheeses. Warlocks were the class that could do both, whereas Titans for the most part could help with the Templar cheese. Hunters weren't good for neither so they were seen as inferior at cheating *shrug*. Hence the Warlocks looking down on the Hunters and Titans being the middle ground. The feud shoulda ended with the patch of Templar and Atheon cheeses because it made every class viable. The feud quelled down until around the time the first solo Crota normal run was completed by a Hunter, followed by a Warlock being the first to solo Crota hard. In the end, this feud is incredibly stupid. There's something about each class that makes them OP or weak. That's called balance, who would've guessed? The classes are basically like a game of Rock Paper Scissors..based on how classes use their respective specials against each other: Titan > Hunter. Hunter > Warlock. Warlock > Titan.