New study says millennials are bad tippers

A new study finds that most millennials are bad tippers.

Nearly two-thirds of millennials typically tip below the standard 20 percent at restaurants.

Another 10 percent skimp out on the tip entirely, often leaving nothing for their server.

Cab and ride-share drivers also get shorted on tips.

Researchers say it may be because millennials are more used to using services that don't have tipping options, like buying things online.