I second this. Grace's advice to include women is good. Going to HR is risky. My strategy is to just treat everyone about the same as well as I can. Make sure the pattern is clear in people's minds. Helps if any disputes, esp false claims, make it to HR. I hang out with them, too, if they're alright. I learn from the good ones. Anyway, it has side benefit that they mentally compare their experiences around me with what they hear. Should match.