Many on social media questioned whether Warner's century against amateur players warranted his signature celebration usually seen at international level.
"You'd think he was playing in an Ashes series from that reaction," one fan commented.
Another added: "Why's he jumping about like after scoring a hundred in the club cricket the absolute bellend?"
But there was some support for Warner, despite many fans still branding him a cheat.
"Jeez now he can't celebrate a good innings, get a life," one fan said.
Warner was still at the crease in the final over to help steer Randwick Petersham to a nail-biting victory.
Warner also took a classic catch while fielding earlier in the game.
"As the president of Randwick Petersham, I can't remember as much stimulation and excitement around the club," former Australian Test bowler Mike Whitney told 7 News.
"It's emotional. After all the crap we've been cricketer's … There's a lot of us here. Family, friends, the whole lot. We are close," Warner's father Howard told The Daily Telegraph.
"He's lived through it and he's coming out the other end hopefully".
Warner is currently serving a one-year suspension from domestic and international cricket.
