Churches have leadership and it varies depending on how things are set up. Sometimes it's the pastor making all the decisions, sometimes deacons work with the pastor, sometimes there is a board. These are the people who are in authority to make decisions. Hopefully these decisions will be based on the Bible. Like any authority, church authority can be abused.
I am a little surprised to see so many here push aside the Bible's guidance because it doesn't mesh with their own ideas of how a church is supposed to function. It isn't even ignorance. It is willful disregard.
What would you have church leadership do if a guy came in and started smoking in the middle of the service? What if he wouldn't put it out and refused to leave? I guess you'd better let him do what he wants because he needs to hear the Word, right?