I'm a big fan of instead of positive feedback and only constructive negative feedback ONLY constructive feedback in general. when someone's like that was rad! I'm like.. but... tell me why plis.
I guess I agree, but I think focusing on the bad in a way/for the purpose of progress and critical thinking is important, and what I spend a lot of time doing. It can be disheartening but heart can be taken in the realization of change and setting at the very least an idea for change in your mind.
Either decide to change it, then do it, or decide to not worry about it - what gets me through the day.