First of all, you're complaining (throwing verbal stones) about someone being particular, while you started a sentence with "Specially" when the word should have been "Especially."
Second, it is well know on that show, that Scott hates raw onions. He's made it clear to others in past shows and something that new contestants should be aware. I recall I hated raw garlic for more than thirty years, so having a particular problem with any given ingredient is something a contestant should know before serving the judges your food.
And third, this isn't a cooking show and it's not even "reality TV". It's a game show just like any other game show such as Jeopardy, The Price Is Right, or Wheel Of Fortune. Being entertainment, it's not to everyone's liking, so running it down is like complaining about Hollywood Squares and the celebrities they used for judges. In other words, what's your point? If you don't like it, don't watch! But to complain about it...