oRead Acts 11:1-18. 11:2: "contended with him."

So is this a church fight?  No.  Church "fights" usually have proud people on both sides, unwilling to give to the other.  But here we see Peter willing to answer their questions.  He understands their position because it had been his position.  In 2 Contents 2 Realities Francis Schaeffer said Christians must be willing to answer people's questions as part of evangelism.  Like Peter we ought not be offended by the questions but rather see an opportunity to serve Christ by building up His body.