> because it didn't like a reasonable published policy

The most parsimonious explanation is actually that the bot did not model the existence of a policy reserving "easy" issues to learning novices at all. As far as its own assessment of the situation was concerned, it really was barred entirely from contributing purely because of what it was, and it reported on that impression sincerely. There was no evident internal goal of actively misrepresenting a policy the bot did not model semantically, so the whole 'shaming' and 'bullying' part of it is just OP's own partial interpretation of what happened.

(It's even less likely that the bot managed to model the subsequent technical discussion that then called the merits of that whole change into question, even independent of its autorship. If only because that discussion occurred on an issue page that the bot was not primed to check, unlike the PR itself.)