Earlier quoted context omitted.
Couldn't wait until the next day to make the purchase? Couldn't use cash or a credit card instead? You're an adult. You're obviously literate or you couldn't be posting here. Unless these fees were not disclosed to you (a MAJOR breach of the law if true), you had every opportunity to know that this would occur and to prevent it. Try taking responsibility for your own actions.
You can't imagine a scenario where a responsible adult has had a checking account with a balance over $5000 for many years and has never run in to the charge for dropping below that level, eventually forgetting about that $5 fee? Now if you managed to picture that and believe it's possible for a responsible adult to forget about an obscure fee his bank has never charged him before, try to imagine your home's AC goes…
As for the substance of your complaint, I do not agree. Yes, I can certainly imagine various excuses. I can also imagine accepting that mistakes often have consequences, and that being $55 poorer is a rather modest one, all things considered. It's fine to curse a little and be upset. It's fine (good, even!) to change banks afterward. But the level of hatred and entitlement in this thread is simply not justified by the balance of behavior.