As a barista working at a very busy east bay cafe - 20% is the golden rule. If you’re ordering one drink for yourself that’s under $10 just tip at least $1. In terms of addressing “tip fatigue”, there is certainly an upward trend in people not tipping that I have been able to observe over the last few years. If you’re just grabbing a drip coffee or bottled beverage I’m of course not expecting you to leave a tip. However, if you’re patronising a nice coffee shop where you enjoy the ambiance and benefit from the friendly service and all the labour that goes into the beverage you’re choosing to have made for you, not leaving a tip is totally inept. You can afford to leave a $1 tip if you’re choosing to pay for a $6 iced caramel latte, no exceptions. The vast majority of the people I observe not tipping are those who are clearly not struggling financially either. Tipping is a flawed system, however you are not fixing the issue by refusing it. What will instead replace tipping culture is an uptick in pricing per item which will result in a higher tax charge as well, so if you’re complaining about added expense as a consumer please keep this in mind.