Terriers are very sensitive to raised voices and arguments. My two tend to run and hide or cover their faces, or for a reminder they will bark if John and I have a spat. Jack will automatically take my side Millie just runs for cover and stays away until she is sure it is safe to come back. Not to ask for details but is your dog a rescue and if so what was his backround, did he come from an abusive home and maybe that is why he is staying away making sure that it is ok to come back and he will be like Millie only if he feels it is safe to come back and not before then.

Try reassuring him give him a rub on the nose or under the chin if he likes it just while you are passing if he growls leave him you can pm me or mail me if you think it might help I know what it is like for this to happen