The founder of Reddit was reacting to the progress Serena has made by getting to the Finals of Wimbledon this year.
It was two hours past the scheduled time when Serena chasing a fairy-tale eighth Wimbledon title hit the first serve.
And she was unable to come up with an answer for the questions posed by Kerber, the first player in the world's top 50 that Williams faced at the tournament.
Serena Williams will be cheered on, albeit quietly and politely from the Royal Box, by her close friend Meghan Markle, the new Duchess of Sussex, during Saturday's Wimbledon final but when it comes to tennis royalty, there will be only one queen on court. "She played out of her mind".
The 30-year-old gave Williams a very different test to what had come before, with Kerber among the leading counter-punchers in the game. It was the second longest semifinal in Wimbledon history, trailing only Kevin Anderson's victory over John Isner on Friday. It is Djokovic's first final at the All England Club against someone other than Roger Federer, Rafael Nadal or Andy Murray.
Kerber bided her time as she waited for a high lob to drop and she whacked a forehand down the line to open up her first match point. Serb Djokovic leads the head-to-head 27-25.
"You can't replicate match play in practice".
Speaking after her defeat at Wimbledon, Serena admitted she really wanted to win.
"I'm just that person, that vessel, that's saying, 'You can be whatever you want to be.' If you want to go back to work, and to me after becoming a mom, I feel like there's no pressure to do that because having a child is a completely full-time job", she added.
Williams, meanwhile, put in a performance that was characterised by unforced errors as she failed to secure her 24th Grand Slam title.
Germany's Angelique Kerber poses with the trophy after winning the women's singles final match against Serena Williams of the United States.
With both legends still on the rise, it's looking likely that this won't be their last time facing one another for a big title.
Kerber is a former No. 1 who has won two major trophies.
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