In the end of the day, the way you act is how you represent yourself, and who you are in this life.
The way you respond to other people's actions, no matter how low they may get, is included as well.
You should carry with you quite a clear understanding of who you are, and how to represent yourself accordingly. Don't change it for anyone, no matter what you think of them or feel for them. Your opinion and voice always matter. In every situation and with every person, think how you can benefit from it, while making the best of it.