Here's the thing, though: you're looking at a very limited set of interactions (namely, n=1), and declaring that the developer of ureq is awesome and polite, and that the developer of actix is an asshole.

You don't know the history of either project, or either person. The developer of ureq probably has some bad days and responds in ways that their not proud of. The developer of actix has probably had some (many?) good days and responded politely and helpfully.

Indicting the actix developer given a small set of responses to a particular class of issues is a bit unfair.