If one can take minutes even hours from their precious little time, to give negative feedback then I don’t think so, it should be much of a bother for them to say something nice, for a change.
But I guess, sometimes it is. Probably because they are so used to giving negative feedback that it just comes naturally to them.
I wish, there are more people who can say something nice, something pleasant. I wish, more people can be polite, by nature.