"You are condescending" is different from "I find that argument condescending".
The latter is attacking the argument, the former is attacking the arguer and is designed to provoke and therefore inflammatory.
My understanding was that this is against the rules - If I am wrong and a moderator would like to correct me please do so as if the rules are open to interpretation in this way then perhaps they should be clarified?
You state that you cannot take your endless argument with DWA to the Tar Pit, have you considered taking it to PM or starting a new thread when the existing thread descends to an endless argument between the two of you? Whilst not in the rules, it would certainly be polite and courteous to the original poster and others trying to have meaningful debate around you.