A policy of not providing a detailed explanation every time someone complains is a policy. While you may not be debating that thread should or should not be locked, you are still debating policy. In fact a reason was given why the thread was locked. You didn't feel it was detailed enough and demanded the mods provide a more detailed explanation of their justification for locking a thread.
It is this specific aspect of the policy that you are debating, "I don't always have the time to explain myself (nor should I have to) as to why I lock threads. Sometimes I will, sometimes I won't."
So yes, you are debating mod policy.
Dude, that quote you just bolded was to my question of why do they not inform a poster as to why.
No, where did I say his policy was wrong. So me debating his policy never came into play. Unless you consider someone asking questions to understand the policy as debating.
I also ended my reply with
Sorry, for asking for clarification.