Faldage suggested that:I think that the usages that we find objectionable are the ones that violate the rules we learned at our mother's knees. For example, my father used the word irregardless frequently with, I think, humorous intent. In a similar vein the only time I ever heard may used instead of can in the manner drummed into our tiny little heads by our grammar school teachers

Setting aside the shocking way in which you jump to conclusions regarding the sex of the primary parent, I find myself agreeing with this entirely. Probably because I did learn the "can I/may I rule" at my (grand)mother's knee, or at least at her dinner table. So, as one proud to have been raised by a devoted single father, I do proclaim that you may be excused for your lax attitude toward the misuse of "can."