Some of us are sensitive. So when someone is aggressive, or even a little loud, we get our feelings hurt.
"Only a really bad person would do something like that. So I don't want to work with him. The deal's off."
We assign the worst possible motives to the person. But in fact, people's motives are usually better than we assume.
Evil people do exist in this world, but they are rare. And they're trying to take over the world, so probably don't have time for a small business in the countryside.
Go ahead and open your heart, not just your head. Just don't be a doormat.