Why the hatred for jump cues? You ask a fair question. I'll try to give you a fair answer from an old-timer's perspective.
It's not really jump cues as such that I dislike. It's the changes that have happened to pool over the last 30-35 years, and jump cues, phenolic tips and so forth are just a part of it.
In an effort to increase TV coverage and the fan base, the tournament game was switched back then to nine ball. Nine ball meant that the break became very important, so players had to learn how to hit like Superman, with leaps and bounds and flying cue balls. Those of us who grew up with straight pool, a game of finesse, did not welcome this change. It's not right or wrong, we just don't like it. We think it lessens the game. The emphasis on the break eventually led to phenolic and G10 tips, but those are just a symptom of what we don't like, not the cause.
In a further effort to speed up the game, the penalty for a scratch or foul became ball in hand anywhere on the table. That penalty for not hitting the lowest numbered ball was so severe, particularly at the pro level, that jumping became an important part of the game. Jump cues are the result. Again, just a symptom, not the cause.
We old-timers liked our game better. Besides finesse, straight pool (or one pocket) requires more thought and creativity. In nine ball you know what your next shot is going to be, and that takes away a big part of what makes pool challenging. It all becomes execution, like bowling (well, not that bad).
The hoped for TV coverage hasn't worked out, as I guess you know. We are now left with a game that isn't any more popular than 30 years ago, but with a whole generation of pool players who know nothing but nine ball (eight ball too, to be fair). That is a shame. Not long ago I was at a room playing straight pool with a friend, and I heard some guy ask the counterman what were we playing. Worse, the counterman told him it was straight pool, a good beginners game. As Marlon Brando said, "the horror, the horror".
So ... jump cues, jumping, monster breaks and flying cue balls .... it's all a result of the attempt to make the game spectator friendly, and it's changed pool in a big way. Not for the better from our perspective.