Not saying you're right or wrong - personally I like the palette but not the theme - but these comments give off a pretty arrogant attitude that I think is uncalled for.
I am curious how you think I could have said "dude you are making this so fucking hard on yourself by choosing to have next to no value contrast, here are some ways I regularly have to check that I'm not doing this by mistake, good luck figuring out how to get everything else so amazingly perfect that it overcomes this giant deliberate flaw" without sounding "arrogant".
I’m glad I achieved my main goal though.
The artist isn't being arrogant. You ignored what they said and talked down to them, and they stood their ground. Now you're acting like they're doing something wrong, and publicly criticizing them.
No, it's not arrogance. It's just that you are arguing without understanding.