I find, if you have a few good friends, they are likely your friends for deeper reasons than just fun, you trust these people. So if you are dismissing them a lot, thats bad. If they got this far with you the probably have a pretty good head on their shoulders. I try to do my best not to just dismiss Chazzykins for sure, but say irritating family members? Much more problematic, them.
I realized that a lot of the stuff my mother told me about life and living when I was a kid was extreme oversimplifications based on her general refusal to either explain anything (she use to lie to me a lot, and being a kid, I stupidly would repeat this stuff to others and get in shit for it) or because she herself dismissed every input from the world around her. She's also INFJ and a underdeveloped one.
However, if my Dad chooses to tell me something, I damn well listen cause he doesn't give advice often. Except when it comes to conflict resolution cause he usually says "Kill them with force lightning!" XD.