Just ignoring a coach can cause them to blow up because you have not listened. If a coach is trying to officiate, let them know where things stand and draw a line in the sand. If they have been decent and have a question, listen if it makes sense and quickly explain if possible. Just letting the coach know you here can defuse a situation. The key is to know when a coach is giving you crap or really thinks there is a problem htat needs to be brought to your attention.
Communication is VERY important.
Know how to do it and when. It may be easier, but that does not mean it will make the game better. The best officials know how to handle coachs. I agree that a lot of time officials are too quick to T up a coach. I am a new official this year and I haven't called a T on a coach yet.