Nick Kyrgios responded to fans who booed him at the Shanghai Masters by saying: "I don't owe them anything."
The Australian patted the ball over the net several times when serving as he lost 6-3 6-1 to Mischa Zverev.
He also began walking back to his chair before a serve from qualifier Zverev had landed, argued with a fan and received a code violation for swearing.
It came a day after the 21-year-old said he was "bored" during his first-round victory over Sam Querrey.
Kyrgios admitted he "took the easy way out" and "tapped out a little bit" against Zverev, but insisted the crowd were wrong to criticise him.