Advise a friend who response to conflict by avoidance on why it is not healthy in sustaining positive relationships.

I would tell him or her that avoiding conflict will not solve their problem and it will harm any good relationship that they have.  I will advise him or her to face the issue and resolve either by having a conversation or even asking for help from others if would solve the conflict.  Avoiding the issue would only make the problem worse.  By approaching the problem calmly and intelligently can they resolve conflict and maintain their relationship with others.