But isn't this a spiral down? and impact your confidence with signs of quitter?
Say OP is in a startup currently , this downgrade will mean a jump to a big MNC to a services offering to a outsourcing company. The issue at hand has to be handled at some point right?
You would be surprised at how difficult it is in any company (large or small) to make a change on culture. That is completely driven top-down, and normally the "spiral" you speak of is more inline with a individual contributor (non-manager) trying to "change" the culture, even if it seems positive to the individual, in an even more toxic relationship.
"Signs of a quitter" should never be used as an excuse to continue with a toxic company. You should also not be surprised at working 70-80 hours a week, going "above and beyond" then being let go for a Sr. management bonus :)
Loyalty is pretty illusive now days on the side of companies it seems. It is still an employers market, despite the "we can't find talent" laments.