I see a few top level comments agreeing with the sentiment that users are being entitled or abusive, but what are they actually referring to? The linked image certainly has no evidence of such behavior. Someone who claims to be the developer filed a deletion request for the duckstation-git AUR package on the AUR and they say:

Every time, it turns into abuse towards me, as you can also see in the comments for the package.

I read through a few pages of the comments here and they're mostly people talking about fixing issues with the package, and what to do about the dev purposely breaking the build... I only found a single message that could be called abuse:

@eugene, not really but i suspect it's an uphill battle, check the commit message: https://github.com/stenzek/duckstation/commit/30df16cc767297c544e1311a3de4d10da30fe00c

FWIW, I'm moving to pcsx-redux, I rather run a little bit less advanced PSX emulator than software by this upstream asshat. Regardless, much thanks for maintaining the AUR package so far.

And even this is not a good example of what stenzek is describing. For one, it's obviously a reaction to stenzek's hostile changes and not the sort of user coming for support and being abusive that stenzek is talking about. The user is also explicitly moving to a different emulator and not expecting any change from duckstation.