If you have a small open source project, absolutely.
In the case of Notepad++ I would say this would be a very fast path to burnout. I don't believe anyone has the mental power to deal with the ammount of assholes out there, you will just crash and burn.
It's important to separate your work from yourself. The user was frustrated by the software, not by you.
Well...
> You have made what used to be a good editor into a massive pile of garbage.
I’d say the person is frustrated by both.
Yes but why should the maintainer be obligated to endure that? Just because it's a _human_ thing to do doesn't mean that it's a correct thing to do.