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Argentina goalkeeper Emiliano Martinez has been criticised for the excessive tone of his celebrations.
He carried a doll with Mbappe's face on it while standing alongside teammate Lionel Messi as Argentina paraded the trophy back home.
Martinez, who also made a crude gesture after winning the Golden Glove award for best goalkeeper, was filmed mocking Mbappe in the team dressing room after the game.
"Those celebrations aren't my problem. You shouldn't waste energy on such futile things," Mbappe said after PSG's win against Strasbourg on Thursday (AEDT).
"The most important thing is to give my best for the club."
Mbappe became only the second player to score a hat-trick in a World Cup final but ended up on the losing side as Messi's Argentina won a tense penalty shootout following a wild 3-3 draw on December 19.
Mbappe converted his spot-kick but was inconsolable after the defeat, slumping in a chair and then walking around in a daze.
"I don't think (the defeat) will ever really be swallowed. But as I told my (PSG) coach and teammates, there's no reason that my club pays the price for a failure with the national team," Mbappe said.
"It was a complicated time... (But) PSG isn't responsible for our defeat. I tried to come back with the best energy possible, being as positive as possible."
He showed his composure from the penalty spot once again by scoring a spot-kick deep into injury time as the league leaders scraped a 2-1 home win against Strasbourg.
"I didn't have an amazing game, but I kept believing, pushing," Mbappe said, adding that it was a different kind of pressure taking PSG's 96th-minute penalty.
"They're different emotions, different scenarios. This time it was a penalty for the victory," he said.
"The message is clear: no matter what happened with the national team, PSG is something else and I'm determined to bring all the trophies back to the capital."
He is looking forward to playing with Messi again.
"We'll wait for Leo to come back so that we can start winning games (together) again and score goals," he said.
Messi was given extra time off by PSG to celebrate in Argentina and is expected back in training early next week.
