Unfortunately, even a 15% tip (which your 10% then add back half would result in) would be considered "shitty" by bitterwaitress.com. ("A shitty tip is any gratuity less than 17% for service which one's peers would judge as adequate or better.")

You know, I've had people tell me my usual 20% tips are over-generous. (I usually figure that tolerating my fat ass long enough for me to feed my face is worth hazard pay.) Yet, by this waitress's standards, I'd classify as "barely tolerable." I think the biterness may come mostly from having her standards set WAY too high.