I can't think of any other reasons. They were off-topic hit and run posts designed to troll/bait/flame, and he seemed to have no intention of discussing his opinions on the matter despite being relatively active in comments.

As for your last question we use the term "Shitposting" generally used for anything non-constructive, obstructive, hateful, trolling/flaming/baiting, off-topic, etc., generally any post whose sole purpose is to cause a negative reaction on the reader.

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