I'm not a "nice" person per se. People who are nice to everyone tend to be assholes, liars, and/or manipulators when it really comes down to it. They are nice insomuch as they do so to navigate social circles more easily and to be liked or have people click a like button on FB. Essentially the nice people are the fakers!
I'm respectful but if you're a bad person morally (will step on others to make money/to network in even the smallest way) or if you think about yourself (and your friends) before you think of others too often, or if you are only driven by ambition or success, I want nothing to do with you and your kind.