The nine-seeded Fritz punched in the match ball and then howled the crowd, making incendiary lunges with his arms before thanking a very disappointed Rinderknech in the electric light.
When former Wimbledon winner Marion Bartoli was about to conduct the victory interview on the court, the booing continued.
"I'm sorry, but I can barely hear what you're saying," Fritz continued, continuing on the ironic track.
"Wanted to win in front of the audience"
"I honestly think the crowd was fantastic, it got me excited. They cheered for me so much that I wanted to make sure I won in front of it," says Fritz, who showed character.
"You have to be brave to do that, but it's not certain that the audience will forget this," an English-speaking commentator told Eurosport's broadcast.
In the third round, Fritz will face 23-seeded Argentine Francisco Cerundolo.