This raises an interesting point.
Why are these people the type of folks we would rather not see on Sundays - why do we wish they left our churches for other fellowships?
If it's simply nasty, rude, difficult, tiresome conduct - I hear you all. However, if they are difficult with everybody, over time, what will happen? The rest of the congregation will avoid them.
The last time I moved churches, a few years ago, there was one particular woman who had a bad reputation. She was rude, annoying, and immature for her age (she's now about 35 or 36). I did not get along well with her. A brother who became my friend and who to this day still has anger issues (the Lord is working on him) told me back then that he strongly disliked her due to her rude behavior, and after I left, he told me other people would literally (but very subtly) 'clear our' during the fellowship time when they saw her coming.
Neither the brother nor I cared about annoying sister enough to confront her. And apparently nobody else did.
Also at that church, there was a young man who had terrible social manners. The guy wasn't mean or rude, but he was quite awkward and said strange things. People also avoided him.
In the fellowship I'm now in, there are people who don't think before speaking (and these are "repeat offenders" who offend others occasionally, to the extent others have confided in me how much their conduct/words have angered them).
Finally, I ask: how often have we applied Matthew 18?
In my own church, and in the church I left, there was a strong culture of NOT confronting. This was very cultural (by this I mean people's upbringing), of rather letting things appear "OK" and to ignore issues unless they became too obvious to ignore. People in both churches justified this by saying "I do not love/care for him/her enough to confront him/her," and also because the offenders and the offended often had effectively no real relationship/friendship, and rather, were mere church acquaintances, and as such, the offended chose not to confront because they didn't want awkward confrontations.
I will admit I myself have had such attitudes and have not always - in honesty, I have not very frequently at all - used Matthew 18 even when it was with somebody close to me. So I must confess I'm part of the problem.
How many of you have used Matthew 18 in a biblical, loving manner? Do your pastors condone it, encourage it, and exemplify it? Do you belong to churches where the culture encourages gentle, loving, firm, respectful, private "correction" so offenses are eliminated, relational health is restored, and resentment/bitterness/grudges are avoided?