"Millions of quiet Australians have done the right thing, and they didn't seem to be that concerned about their health, or their businesses, or their jobs," he said.
"People who would turn up to a rally this weekend would be showing great disrespect to their neighbours. It's a free country and we have our liberties but the price of that liberty is exercising it responsibly."
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His comments came hours before a person who attended a protest in Melbourne tested positive for coronavirus.
Authorities say the individual, who developed symptoms on Sunday, the day after the protest, wore a mask at the protest.
"They weren't symptomatic at the time," Victorian Chief Health Officer Professor Brett Sutton said.
But he said it is possible the person was infectious at the time they attended the protest.