I've only used the flag system to notify the mods of a dealer who promotes what he sells. Fortunately it's only one dealer and yes most of the time the mods have agreed.
Why flag a post?
Just interested, being here on the forums for almost twenty years I have never flagged a post. The function must be there for a reason though. We are all different. Are some just more easily offended, or more sensitive to the, at times, course ebb and flow of the forums?