Oh, for the days of Jack Kirby, when not everyone in comics was expected to talk like some mall rat teenager.
I think the first time I noticed this trend was back in Buffy the Vampire Slayer. Even ancient vampires like the Master and ancient demons like D'Hoffryn started talking like they were from Malibu. Whedon's done a lot of good work, but that trend of his really has gone too far, hasn't it? I think even he got tired of it, because while his Loki was crude, he was a distinctly Asgardian aristocrat flavor of crude.