That largely depends on what you are believing "ok" means.
Since we're dealing with laws here, 'grey areas' are kind of a bad thing.
In response to the whole kool kids klub brown townogy, the black pizzeria owners should have to serve them. It doesn't matter whether the discrimination is really heinous or not because it's discrimination nonetheless. If you own a pizzeria, your job is to make pizza and exchange it for money. That's all. You aren't some kind of moral arbiter of who deserves pizza and who doesn't, and society won't work properly when pizzerias start doing that.