Observational learning of gender appropriate behaviours can be influenced by the media e.g. TV, books, and social platforms, where men and women are often portrayed in very stereotypical ways.
Similarly to social learning theory, when the models are praised for their behaviour, we are vicariously reinforced, meaning we are more likely to display that behaviour, and when we see those being punished for not behaving accordingly for their gender we are also reinforced. When we then display the behaviour similarly to the models we get directly reinforced, helping to maintain the gender appropriate behaviours. Eventually the attitudes and behaviours of these models become internalised, meaning that we believe these gender appropriate behaviours are the correct way to behave.