When dealing with a party who only wants to "win" as measured by your "loss", you are in a state of competition, regardless of what you want, by default. However, this can easily lead to the massive distraction inevitably caused by the ensuing battle unless, throughout all of this, you can see what you're trying to establish in the end.
Lose sight of that, and you're just going to get endless war.
I'm not talking about you personally, but one can choose to condemn their prejudice as an example, but that doesn't improve their standing. Maybe it helps with looks in some eyes, but it's important to notice if there is an alternative of any substance being provided or is it just tearing down someone else?
What I'm advocating is make the goal to end the prejudice for everyone's benefit, and show people how that works - keeping the bigger goal in mind.