Is This Rude or Just Clueless?

So at the condo we stay at in Chatham, we often see the same families year to year-- and my parents have befriended some of them-- so an older mom that lives in New York City . . . a woman who I haven't seen since last Fourth of July, who I would say I know tangentially in the least, and who I've never had an actual conversation with . . . greeted me in this fashion when I first saw her at the pool: "I have a favor to ask you . . . do you think you could teach our son how to ride a two-wheeler, he's seven and a half and he still can't ride," and though her husband was playing with their son in the pool, right there, he didn't say a word-- so I'm not sure which is ruder, asking me that monumental favor, or standing there-- as a dad-- and letting your wife ask such a monumental favor and not saying something like, "She's just kidding . . . you're kidding, right, hon?" but he didn't say anything and so I was forced to answer her and I should have said something about the time, effort, pain, and suffering it usually takes to teach a kid to ride a bike, but instead I suggested that she "take him to a ball field" where he could ride on the dirt and not get as scraped up (and my parents reported that they did see them all at a ball field, their son decked out in elbow and knee pads trying to ride a bike that was too small for him).