Kids are big consumers of sitcoms and they are influenced by the messages that are written into the scripts. I have seen this with my own children, who are now adults. I saw them pick up many of the beliefs and attitudes of sitcoms and other entertainment. Then when I told them that they had been influenced by tv, they would deny it.
Propaganda works. That’s why Goebbels used it. Propaganda works on the emotions and it takes a strong and mature person not to be influenced.