I think you’re old enough to know the old adages: No good deed goes unpunished. The road to hell is paved with good intentions.
The other mistake you made was assuming that this lady was stupid, which with all due respect is pretty arrogant. She wasn’t trying to insult you; she’s just as skeptical about you as you are about some of the manufacturers touted here. We have the advantage of having gained knowledge from all the enthusiasts here. She just wants something that works at a decent price.
Look, if she wanted to go to Amazon and buy a light, she wouldn’t have been at Home Depot to purchase one in the first place. Maybe you could have told her that you are a flashlight enthusiast. Then again, she may have been the one to run away, because how friggin’ weird is that? You can’t talk to people while stuck in a bubble. Our community is a tiny fringe of a fringe of the population. I build electric and acoustic guitars, and it’s not easy explaining to people why my guitars cost more than a Martin or Fender or Gibson, even though no one has heard my name. But I somehow convince enough people to buy my guitars. It’s not your fault. And it’s not hers - she has enough problems deciding what to feed her kids and what clothes to buy them. This is a hobby for 99% of us. Got to keep things in perspective.