How does look, tone and voice manipulate behavior
I don't know if this will help you, but when I first started to see patients (somewhat similar to customers), I was taught by attending physicians that what I  felt after a few minutes was most likely what the patient felt because of clues given off by patients in their look, manner, words, posture, etc. If the patient felt hopeless, I started to feel that way as a doctor; is he felt anxious, so would I; the same with anger. Once I really trusted that, I could step back from it and use it as a tool to understand the patient's feelings.

People who do not hold anything in them and behave as they see fit are usually not well adjusted socially, and that intimidates people who are more empathetic.

You ask:


  Should such susceptible people keep being socially avoidant type of people to avoid conflicts or become as their opposites through cognitive behavioral therapy or hypnosis?


Before seeking cognitive therapy to become more assertive, there is the possibility of trying the following (which is what we were taught to do as physicians):

1) Step back in your mind and describe how you feel (angry, afraid, insignificant, anxious, what exactly?)
2) Decide what the opposite emotions are (calm, confident, capable, peaceful, etc).
3) Try responding consistently in the opposite manner until they have calmed down (it usually works). It's like taking the wind out of someone's sails instead of blowing back. (This will work if someone is normal. With mentally ill patients, it's still very helpful, but there are other behaviors to use as well.)

This way, you can defuse situations instead of escalating them while staying true to yourself.