I always ask a stranded rider if they need a hand. In years gone by, you got either a "yes please, do you know how to get this tyre back on" type of response, or " no thanks, I've got this" type of response
Yesterday I passed 3 (separate) people stationary, fiddling with their bikes: one mending a puncture, one trying to stop his mudguards rubbing, and the third struggling to get a chain uns(t)uck. At the offer of help, I got
@Racing roadkill 's second quoted response, but this was Cornwall, not racing roadkill country.
Still good to offer (despite any less than positive responses received - don't be so sensitive or disappointed) in the hope that, when despite your forward thinking and equipment (your chain splitter, spare link, patches, spare tube, multitool, levers, pump, zipties, boot, spare bolts, debit card), you are by the roadside and DO need help, the karma you've generated by months/years of offering will come good, and someone will stop and ask that question "do you need a hand".