Publicly, yes, but I still believe it needs to be done in person, directly to them. God tells us if someone is caught in sin to go directly to them, if they don't listen, bring another and if they still don't listen, they're to be taken out of the church. We don't do that anymore. We talk about people behind their backs which doesn't do them or us one bit of good. Better to pray and ask God to reveal their heresy. He will.
He already has...people are ignoring it, though (worse yet...defending it).