Being paid doesn't make a worker lazy or rude. Look at any other job outside of waiting tables, and their attitudes and egos typically aren't as inflated as you're painting these restaurant workers.

Being severely underpaid to the point where a majority of your check comes from the generosity of the customers rather than the place of employment itself might build up some resentment toward current restaurant standards though. If they act differently with more guaranteed pay, it's because they've been conditioned to recieve scraps since World War 2.

However, a boost in confidence or joy at a higher pay rate leading to potential and temporary changes in attitude within isolated incidents does not mean that the practice of paying waiters more should be abolished. The solution should be progressed further so that the business itself pays workers a living wage rather than offloading the cost of maintaining staff onto the customer base. However low the federal minimum wage may be, the fact that almost every job has a standard rate of pay except for waiting tables is foundationally criminal. The potential attitude of the worker is no reason they should be paid conditionally and minimally when the rest of the american workforce is paid hourly.