Warning! Spoilers ahead for Young Sheldon season 5.
A brief comment from George in Young Sheldon season 5 indirectly criticizes Penny's past in The Big Bang Theory. Sheldon's (Jim Parsons) dad never physically appeared in the nerd-centric sitcom as he was long dead before the events of The Big Bang Theory. But while George (Lance Barber) never met any of Sheldon's friends, a remark he made in Young Sheldon season 5, episode 19 can be interpreted as a subtle dig at Penny (Kaley Cuoco).
The Big Bang Theory started just after Penny moved into the apartment across the hall from Sheldon and Leonard (Johnny Galecki). At that point, the 4A boys had already been roommates for several years. The three quickly became friends, although that was primarily because of Leonard's attraction toward their new neighbor. During the early seasons of The Big Bang Theory, Penny was depicted as the stereotypical blonde bombshell who mingles with the nerds. Reinforcing that stereotype, the sitcom also blatantly sexualized the character, and oftentimes used that as the basis for many a cheap laugh.
Related: Young Sheldon Breaks Its Biggest Big Bang Theory Connection
Early on in the CBS sitcom, Penny got a reputation for sleeping around, and the show leaned on it for a while. In The Big Bang Theory season 3 episode «The Staircase Implementation,» a flashback scene revealed her back in Nebraska nonchalantly taking a pregnancy test as if it's something that she's used to doing. Given Georgie's (Montana Jordan) current predicament in Young Sheldon, Penny is the kind of girl that George is describing when he explains to his son that there are girls who like to sleep around. In the conversation, the Cooper patriarch is trying to make sure that
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