I mean...you have a good point in there...somewhere; I think you've gotten to the root of the issue. And yet, at the same time, I kinda have to say "eeeeh...not really...?"
I wasn't exactly 'trashing' them per se...I was pretty rough on them, but my goal was to deliver an honest critique of how their work complements the story, not to insult them. I believe I have the right to do that to anyone, peer or not...the majority of the shame doesn't come from any socialized stigma on my right to give critique, but on the uncomfortable realization that my words might have been softer if I had known who they were...which means I'm not quite as impartial as I like to think.
...I actually don't believe that to be true. It is true in some cases, and in some elements of some cases, but on the whole it's a bad generalization at best.
Beginners make lots of deliberate, and might I add, good choices (I should know, I am/was one); not everything they do is because they 'just can't do any better'. And pros have limits too: deadlines, stamina, motivation, or just being in the wrong frame of mind one day. Not everything they produce is exactly what they intended; that's a rather unrealistic expectation to have.
In any case, I do think there's a need to question another artist's style, especially when it comes to hiring them to draw for a story that's already written. Do you want someone who only does 'dark and gritty' to draw for your super kawaii children's magical girl manga? Conversely, do you want someone who only does 'super kawaii' to draw for your historical fiction WWII drama?
Style matters. And when there's a large gap between the story tone and the art style, people aren't wrong to question it. Sometimes it's intentional. And sometimes it's not...which is usually a problem.
Uh, actually, BAD fans do that. The idea that anything you consume is trash unless it appeals perfectly to you is childish and ignorant.
I'm a fan of many artists who work in fields that I've never even touched before, and I'm happy to report that I don't believe anything of the sort. =/