When I was a waitress in college at Cracker Barrel the waitresses thought very little of Christians. Why, you ask? Well, it was known that if a family prayed before a meal that you'd get a little tip (10% or less).
I would cringe inside when other waitress would bemoan having a "Christian table".
What would make it worse is when they'd pray and then be demanding, complaining, and down right annoying (trust me I had my fair share of these tables) then they'd leave a small tip with a track on how to become a believer.
It would make me want to run out to their car and tell them I was indeed a believer and a world is watching...so have better etiquette!
Do we take into account how we are speaking LOUDLY our beliefs with our actions? We, as Christians, need to be different! Sure, there are bad waitresses out there who give bad service, but how we handle it can be honoring to Christ.
Think about all the people who are "watching" us....waitresses, check-out clerks, bank tellers, over the phone sales people, receptionists, guest relationships staff and medical personal. What impression do you want to leave? Do you want to leave people with an taste of experiencing Christ?