Being kind and nonjudgmental is key. Remember you are representing all vegans when you go out into the nonvegan world. If you act like a dick people are going to associate most vegans as dicks. We already get stigma for that.
Listen and show respect to others, even if they are arguing at you. Everyone has a right to be heard and deserves respect, and there’s always a chance you can learn something from someone else, even though you might not agree with it.
Be compassionate and peaceful.
Teach, don’t lecture or argue.
Have a sense of humor and be nice!
Hold vegan bake sales and include PETA literature with each sale.