Eeeeeeeh.
I'm sure I'll be alone on this, I don't really blame Timmy for his actions in the episode (I haven't watched the second one).
I mean, the poor kid had to be genuinely miserable for a chunk of his life to get his fairies, with a murderous babysitter, parents so neglectful they forget to feed him, an insane teacher and absolutely miserable grades, and constant bullying alongside having very few friends. Chloe's problems amount to "One person doesn't like her, and occasionally she messes up but no one actually cares when she does", yet she gets fairies. I'd be monumentally ticked off, too. And his actions did just amount to trying to not let her have fairies, it's not like he actually hurt her.
Not that I'm saying he took the right actions, just that I see where he was coming from and have a hard time disliking him over it.
Then again I'm not exactly a fan of the character, so I'm not an unbiased source.
Unless we're talking about some other act of meanness.