Profanity laced, all caps tirades against underperforming agents are actually super common, a lot of people do it and don't talk about it, so don't feel weird.
It would be rude if you said it to a person, so it counts as rude. If it isn't rude simply because its directed at a LLM, then the entire premise of being rude or polite to LLMs evaporates, but that's not useful.