Neglect your negative biases.

When in doubt, assume the best.
Say you suspect a co-worker doesn’t like you. Regardless of whether that’s true, your behavior will alter in ways that won’t help your relationship.

Give them another chance.
Let’s say you get screwed over by some blond Dutch guy, so you swear never again to trust blond people from Holland. For the rest of your life, you’ll be suspicious of all blond Dutchies without facing the truth that most of them are pretty decent. It’s most realistic to assume the best—to give them the benefit of the doubt.