North America has gone crazy with tipping and guilt. I've attended functions held at restaurants where food is available for individual purchase and had 18% tip added into my bill. I'll tip, but don't tell me what my tip obligation is. I pullout the pen, cross out the "tip" and recalculate.
Recently we went to a well known Italian restaurant that is staffed by "actors" with visiting family. They sing in between service. Sometimes they spend more time on their "act" and less on the service. Our waiter didn't give us anything close to service. He performed then would hang out in the corner showing the other waiters photos on his cell phone. We stiffed him, except for the change. He had the balls to confront my Mother as she exited the washroom, stating "that was a poor excuse for a tip". She looked at him and told him "it wasn't meant to be a tip, you are a poor excuse for a waiter and we just didn't want to wait any longer for you or the change". This was mid week and quarter full restaurant. The guy only had 2 tables to serve.
I recommend watching the documentary "Up The Yangtze"
. It's very interesting and well done. There's a great scene where the staff of the ferry are instructed how to act so that they can generate the bigger tips from the Americans. The boy featured in the doc quickly learns how to make a quick buck off our learned behavior. We've sent a great message to the rest of the world.