Part of the problem is that there is real lack of good physical Fire type attacks. If we exclude legendary-exclusive moves (V-Create and Sacred Fire), then Flare Blitz is the best physical Fire type move. If you don't want the recoil, then Blaze Kick, which has really limited distribution is the next most powerful, but even it isn't that good with 85 base power and only 90% accuracy. From there we have Fire Punch, which really wouldn't make sense on Flareon (no fists and all...). That leaves us with Fire Fang, at 65 base power, as the next best physical attack.
So Indigo is right, GameFreak doesn't really hate on any particular Pokemon - at least they gave Flareon Flare Blitz in Gen VI. My guess is that until a better physical Fire type move is introduced Flareon will pretty much stay the way it is, simply because of a lack of good moves, not because of any particular hate for Flareon.
Personally, I would like to see a Sacred Fire Flareon, but I really don't think that will happen any time soon!