I've overheard a similar conversation in which I agreed far more with the LBS guy, it went like this.
Customer: "we're heading up to ride a loamer we've head about"
Shop guy: "Look it's just pissed it down for two days straight, could you please ride something else today"
Customer: "fuck that dude, we've gotta hit it before it gets roached"
Shop guy: "I know the builder and he'd really appreciate it"
Customer: "like it matters if two guys ride it"
Shop guy: "what if everyone thought like that?"
Customer: "eh?"
"I do like how you generally bring an open-minded and positive vibe to the threads you participate in"
- Morgman