I think one could argue that your supposed sinkhole is still "using CF". I still don't agree with your response "that's what I said", and I think you don't really know what they're using anyways so this is a pointless argument IMO.

Either way that's no excuse for the attitude. Please try to think about how your words come across to others and whether you would want to be treated the same way, especially when it is something trivial like a disagreement on terminology.