If you only ever notice problems, people stop bringing you good news.

People learn what you are for. If the reliable response to anything they show you is a list of what is wrong with it, they keep bringing you problems and take the good things somewhere else, and after a while you only hear about the bad half of their life. Your eye for faults did not get worse; your supply of news did.

Fix the ratio rather than the eye. The next time somebody shows you something they are pleased with, say the true good thing first and keep any correction for a second conversation. It is not flattery, it is just making sure people still tell you things.