I tried to teach my children to make their own assessments of people. Don't take someone else's word for it. Chances are if someone is talking trash about someone else. The "trash" is the one speaking out of turn.
What do I have to gain by speaking ill of someone else? OR, what do I have to gain by getting up in their business and trying to tell them what to do? Haven't I got enough of my own crap to deal with?
If someone asks my opinion, I am more than happy to give it. If someone gives me their opinion of someone else, I'll turn a deaf ear to it. Remember this; we all have a story. When you are tempted to judge someone else, or worse, criticize, think of your story. Would you want someone judging you?
Do your best, let God do the rest. Love each other, lift each other up and see miracles happen.