That's a terrible attitude! The OP was nice enough to let someone else take a coveted villager, and you decide to insult him! It was an honest mistake, and you aren't entitled to Colton If anyone's being greedy here it's you.
Rude. She was waiting for another offer. You were fine with it when you were ready to bid higher incase someone else offered. No need to be rude, you'd obviously do the same too. Plus, it was an honest mistake. Besides, she could've got a lot more than 1m for Colton (from experience) easily and you probably knew you were taking it for granted.