By their words and actions.
Solely by their actions.
and their actions also determine what they look like to a great degree
Far too frequently.
by who their friends are,
I don't. :) I'm busy judging myself and trying to change!
By how they treat others, their personality, and how they act.
The way they burp.
I don't judge - its easy to think the wrong things if you do. I get to know them, experience what they like then decide if I want to see more of their view of the world or not & I think it doesn't mean they are wrong if their view of the world is not for me.
On their character
Go to law school