I'm not arguing with you there though. "Me and Dave are just popping to the shops" is also lazy, shit and is chav-speak. In no way am I allowing one and not the other. I find it odd that you hold the opinion that society at large is accepting of this nonsensical grammar but not the American use of "get".
To be honest, I'm personally torn regarding what I think about the evolution of language (are we all going to be talking in textspeak in 100 years?) but Stephen Fry makes some very good points.
We only dislike certain things because they are NEW, and so seem wrong. No other reason. Elements of the language WE speak right now would've been seen as lazy, incorrect and shit previously, so why shouldn't we go back to talking as we did 500 years ago, say? When it was more "correct".