Ultimately, it is always in our own self-interest to be open and vulnerable rather than to be nasty or write people off. The only person we can control is ourselves. When we get cynical, we are the ones who suffer.
When we become alert to our own judgments and thinking, we can slow down our thinking and talk back with a different voice, a voice that has the ability to argue and dispute.
Imagine stepping in front of the mirror and instead of hearing critical comments about your weight or the "f" word immediately jumping into your head, you accept who you are.