Know when it is better to walk away, when it is not worth continuing, when you are better off negotiating with someone else to solve a given problem or when you are better off taking care of it yourself. Pay attention to the balance of power before and during negotiation. Figure out what factors influence that power balance and how you can improve yours and weaken 'theirs'. If you consider each negotiation as an episode in an ongoing relationship, your behavior will be more appropriate. Don't let the situation escalate, civility will slip away awfully quickly and you'll have a very tough time healing the relationship or solving the initial issue.
Negotiation requires an open mind, good preparation, and a tremendous amount of creativity.
If you always give the same kind of responses, that's not creative and it is not likely to contribute to a solution. If your response is unexpected, shows imagination, it is likely to bring others up short and make them think more creatively themselves. Don't assume that a person's ethnicity determines their behavior. The real goal should be to understand how to negotiate effectively to reach wise solutions to all kinds of issues. Then someone invented lawyers, and for the past thousand years or so, we have been 'waging law' to determine who's right.