In this answer of mine there is a disagreement with another user over the validity of my answer.
In response to the user's comment, I edited my answer to provide an explanation of why they were wrong along with an empirical example to demonstrate my point.
The point in discussion is whether a Seasonal ARIMA model can somehow go out of phase over time or not (by definition it can't since the seasonality is built into the model - but the other user doesn't seem to understand that). The user also seems to be making the outlandish suggestion that forecasting a monthly time series 17 years into the future doesn't constitute a long forecast horizon.
The user kept coming back to the point and arguing for his point of view. I've given up trying to debate the issue with him.
But now he's taken it a step further and edited my answer, adding a disclaimer that it is disputed.
I don't want to get into an edit/counter edit battle with this guy (especially since he has a much higher reputation score than me). At the same time I'm certain about my assertion with regards to Seasonal ARIMA models and don't want other users to be misled by the edits and comments.
What is the policy on this? How should I proceed?