"f#ck off, it's free" is possibly an acceptable response if you're also working for free. If maintaining that free software is your job that you are getting paid good money to do, you really should hold yourself to higher standards.
Hm, depends on who is paying you, I think. If some philanthropist is paying you to make good free software, yes. But if you’re paid by stakeholders that want your maintenance to make sure they can use the free software themselves, you’re only really accountable to their opinions.