I thought there was a good point about villains in this article:

“Our current reality is a complicated one, colored in shades of gray, and we’re well past the fairy-tale idea that in this world there is good and there is evil just because. Movie villains that are simply cackling wrongdoers in this day and age register as false.”

Maybe this is one reason why people have so much of a problem with paltry and secondhand Snoke character elements lifted from the Emperor - the Emperor was a villain from a more morally polarized age.