Ookami-kun said:
Honestly, the episode that made me lose respect to Rainbow Dash and her irk is the competition episode with Applejack. It was HER fault to begin with, yet she didn't get any reprimand.
None of it was anybody's fault. The episode went out of it's way to be even-handed and took turns with minor escalation until it was well over the line. There were so many little escalations, it's almost impossible to say where the line was crossed.
If you believe that wings are an unfair advantage, you're likely to think that Rainbow Dash cheated, and if you think that wings are a natural part of who she is, then Applejack was the one out of line by calling her a cheater. Also, Applejack is more mature than Rainbow Dash, so she should be held to a different standard in regards to her unwarranted escalations.
Rainbow Dash could be held to a different standard physically, since she has wings, but being an Earth Pony has it's own advantages, and some of the tests skewed very much in Applejack's favor, and wings were a non-factor in many of the others. The only truly "broken" test was the long jump. So we can't say that being an Earth Pony is a disability.