> What do I do with those reports? Ignore them? Fix the bugs myself? Bleh.

"I don't have access to a test environment, but if you want to write a fix, let me know and I may be able to point you in the right direction" is a perfectly reasonable response.

This, a hundred times. The expectation shouldn't be that you must maintain all scenarios, environments, edge cases.

It's also reasonable to say I simply do not use this software the same way you do. The individual is empowered to fork, contribute and/or collaborate.