Often times I'll run across a FOSS project that claims to solve a problem I have, encounter a bug that makes the project useless for my purposes, and discover that said bug has had an open entry in the issue tracker for years. This even occurs in major FOSS software with paid developers working on it.
Clearly no one actually cares about the bug, and "chiming in" is apparently considered rude. So I ignore your software and move on. Whatever, you don't owe me anything.
Then some day I respond to a forum post by someone asking about experiences with your software, and relate mine. Apparently this is also rude, and I should have filed a bug report.
I guess my question is: is there any scenario under which one can actually provide feedback other than praise that you will accept?