Jesus, buddy, we're talking about a character who makes a lot of raunchy jokes in a cartoon based on somebody's DnD campaign.

I watched a large portion of the first campaign of CR and they dialed up Scanlan's obnoxiousness about 1000% in LoVM compared to the way Sam played him then. They made a purposeful decision to use him for a certain type comic relief and "this is a show for adults" signaling in season 1. If you make being a loudmouthed randy attention whore a character's sole defining characteristic, the audience is going to decide whether they like him or not based on that, and a lot of them just aren't going to be interested when later you go "No wait he actually has hidden depths." That isn't a failing of the audience, that's a failing of screenwriting - and it's true whatever the era.