I mean, it doesn't really apply, but it's a thing that he could say.
As bad as it sounds, it's good to know other people are similarly affected. It demonstrates that the problem isn't just with treatment of one character, it's much broader and deeper, negatively impacting the entire line. Focusing on one particular character is easy for a fan of that character to do, but it's a deep dive case study of something more common than it should be.
What I'm about to say below isn't directed at you, as I know from your posts that you don't agree with Marvel's behaviors. It's more picking up from and adding my own views to what you said that I'm quoting.
The category of constant degradation and embarrassment shouldn't even exist. Writers should care about the characters they're wrong. Not just their personal faves, or who they're focused on, but all of them. At least enough to treat them well. I may heavily focus on Lorna, but I've noticed it hurting other characters too - and called it out in those cases. Sugar Man shouldn't have been written as stupid enough to try to use metal weapons against Magneto at the end of the Magneto solo. Pietro shouldn't have been written as mustache-twirly, cowardly, evil traitor son in Secret Wars: House of M just for Polaris to look good. These characters deserve better.
But people at Marvel seem to think making one character good requires tearing down another character at all times, and as far as I'm aware, it seems to go back to at least the Claremont era. Which could also explain why it's so rampant. People working at Marvel have such a nostalgia-obsessed attitude that they cherish even the toxic parts as if they're treasures. They lack the imagination needed to see any other way of doing things.