"This David Hogg [expletive] is getting a little big for his britches," Stallone wrote Saturday in the now-deleted tweet, according to Newsweek. "I'm sure someone from his age group is dying to sucker punch this rich little [expletive]. Watch him run home like the coward he is. He's the worst rep for today's youth headline grabbing punk."
Hogg recently made news after organizing an advertiser boycott against conservative TV host Laura Ingraham when she mocked him over his college rejections.
Stallone's tweet quickly sparked backlash as celebrities and other social media users defended Hogg while taking jabs at Stallone's career.
Stallone made his Twitter account private after the backlash.
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"Hi I just made my account private so I don't have to listen to a bunch of computer hero's [sic] telling me how tough they [are] and I'm not," Stallone explained in a tweet Saturday afternoon. "In this country you can choose your company."
>> See the tweet here
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His Twitter account was made public again Sunday.