I don't think this specifically is a great example of "being mean", but in the broader ecosystem it's definitely a problem that can wear down maintainers over time. I think it boils down to a widespread sense of entitlement from users of free software. It's amazing the demanding and disrespectful things people will say when the project you've shared with them, for free, doesn't meet their exact needs or preferences.
If something is provided free of charge and it's not working for you, there are constructive ways to engage and help nudge a project in a beneficial direction. But if you're not up to doing that, just move on.
If something is provided free of charge and it's not working for you, there are constructive ways to engage and help nudge a project in a beneficial direction. But if you're not up to doing that, just move on.