Obviously, he should have lent him the Allen key, as we will have all been in need of some assistance at one time or another and conversely, been in a position to offer help to a fellow cyclist who needed it.
That said, I am a bit conflicted, as if it were me in my area, I would have pushed my bike to my local leisure centre where they have a tool station beside the cycle rack, but I already know my LBS is run by an erse.
There is another specialist shop my brother and I frequent, and my brother loves it because its like an Alladdins cave, with constant coffee and biscuits available that attracts cyclists from all over just to pop in for a chat. I hate it, because my order has never been right first time, I have to step over all sorts of junk just so I can speak to the guy, and I can't get my order completed because someone else has arrived for a chat and a coffee, and I just want my job doing so I can get out of there.
Funny how two brothers can have the polar opposite opinion on the same scenario.