Even if not a high level, then s/he had to learn that style of communication from peers in the corp, and the tone is set by managers. It's entirely OK to blame someone who has title “Manager”.
Moreover, OP chose the very thread as the venue, and attempting to switch it to a different, intransparent one is a disservice to the community. Community is very important context of this message, and the response seems to validate the proposition that it's really the end of it, per the subject of the thread.