"Thanks for your concern, but it's only DANGEROUS because of too many ******** behind the wheel; now, unless somebody elected you my mother, MYOB." Tell Madam Nosey that, in your wife's hearing. When wife gets upset that you insulted her friend, tell her it's not open for discussion.

Well, maybe you won't want to take advice from someone who's 2x divorced; but then, neither happened because I insulted a friend. . . .