The bigots work by assuming everyone agrees with them. Talk as if everyone agrees with you
In large groups few people will stand up to make a target of themselves if they think that their position is identical to those around them (see deindividuation ). They're unlikely to stand up and state their views so they let the bigot's assumptions speak for them.
If you know they think otherwise then state this too.
Bigot: "[bigoted remark]"
You: "Just stop, you're embarrassing yourself, no one else here has a problem with us."
You've now put the same effect to your own advantage - just as no one wanted to focus attention on themselves by standing up for you its also very unlikely someone will stand up and refute it your claim they have no problem with you.
Now this doesn't make them 'step up' (i.e. put the spotlight on themselves) but at the same time you've shifted the weight so you aren't alone.
It will also encourage people that actually they aren't alone in supporting you and this could give them the extra push they need to speak up.
