Generally I think it&#x27;s a bad idea to mix tipping and customer ratings.<p>If you buy a $4.50 coffee with a $5 bill and don&#x27;t put the fifty cents in the tip jar, the worst that happens is that the barista looks at you uncomfortably for a second or two. Then you get on with your day. If they rate you along with other baristas (or coffee shops) you&#x27;ll have a reputation before you set foot through the door.<p>Growing up in America, I didn&#x27;t understand how absurd our tipping culture is until I visited Europe.  There, wait staff don&#x27;t bother you every five minutes to &quot;ask how you&#x27;re doing,&quot; you call them over when you need them, and if at the end of the meal you enjoyed your service, you can leave a few euros as an extra, not a semblance of a living wage because the employer refuses to pay it.<p>Still, if it&#x27;s really that important to you to tip your Uber driver, use cash.