I agree in part but also disagree: It has a certain accommodation to it--you are probably fine where you are. I'm fine over here.
But why is this necessary, unless you basically hate a person and don't think you could ever reconcile? It's a psychology of tribalism.
Unfortunately the letter also has a certain "shoot first, ask questions later" aspect to it. Like, why wouldn't Wells diplomatically _ask_ Joyce about the perspectives that informed his writing to the public in such a way?
The "articulate his own values and why as a result he considers it not worth his time" aspect is also a bit of a cringe along the same lines. You can see it all the time today, in comments on things that are shared on various, ahem, online communities. Especially in response to new projects or posts that don't seem completely pragmatic or tuned for performance, as if everything is meant for a paying audience of common moviegoers. Why wasn't I consulted? I'm a common man! I represent your most common audience!
Nah, I think Wells was also feeling afraid of being left out, tossed into the dustbin. Why else would you stake your entire identity so firmly in opposition to someone else, in a letter to that person, instead of keeping it open and asking questions? You're arguing for your own existence. Maslow has entered the chat with some cake and coffee and a monthly stipend.
Finally he seems to project some pretty nasty subjective perceptions right into Joyce's rationale. It kinda pulls Joyce down from what Wells seems to treat as a high horse. But it also promotes Wells' own perceptions all the way down the page. Like he invited himself to a debate and forgot to summon a live opponent.
TBH while it's amusing to read, and especially in a pompous voice, it also illustrates (to some, and hopefully) how we can learn to do much better for ourselves and others as a thoughtful corresponding audience.