The good, the bad, and the necessary of complaining and complainers.

To keep improving, and to communicate efficiently in an organization (and to be grown up) is to understand that complaints are not usually toxic, negative, or a personal attack against you — but are simply feedback. To say to someone not to bring you problems, but only solutions is to guarantee you'll be oblivious to everything that's broken in a company.

(But yes, some complaints are nothing more than unhelpful snark — learn to distinguish between the two)