Source: I am a maintainer of several projects. Some that are used extensively. And I take bug reports seriously, even if I can't always get to them right away.
"it's free, go away" is a real problem. Denying it won't make anything any better or help FOSS get adopted for anything other than servers.
I have experienced it many times before, and almost every time I've gone back to propriety software and breathed a sigh of relief.
Also, "it's free, go away" is a straw man, because the "go away" part is also nearly universal within proprietary software. Try opening a ticket regarding a bug in Word, or AutoCAD, or so on.
The real difference? Those closed products also have closed bug trackers, so you don't get to see all the times users were ignored or told to pound sand.
This "real problem" exists entirely in your head.
Characterizing this as a problem is like accepting free candies from someone and then complaining that you were not given more candies.
(of course i knew someone would try to reply with a "No, it is like <insert post ignoring the point here>" but decided to go with it anyway)
It's perfectly possible to report a bug without demanding that it be fixed.