Lately, I've started to seriously entertain the notion that the term "grammar" should be given up as a hopeless cause. It has been so thoroughly compromised by pontificating blowhards that it should be abolished from serious discussions of language altogether in favor of a more specific indication of what aspect of language we are really talking about. Leave the term "grammar" to the those who fetishize Strunk & White and who have no idea how to distinguish sound writing advice from the idiosyncratic crankiness of long-dead writers who don't even follow their own pronouncements.
Sorry for ranting. I've been reading forum threads that I should know to avoid. But sometimes, when someone is wrong on the Internet, I can't help myself.