Why are females misdiagnosed and under diagnosed?

Girls are socialised differently to boys, and this can result in them displaying slightly different autistic behaviour. For example, I had a strong interest in the actress Kate Winslet and babies instead of the more talked about autistic ''obsession'' with trains or computers (considered to be more boy typical by society at large). Girls might also be more passive and present as ''shy'' at school instead of loud and disruptive. However, it is also a case of what teachers, etc, look for. Even if a girl displays acting out behaviours or male typical interests, these behaviours might be explained away as her just being a ''tom boy'', whereas in a boy, the teacher might think, mmm, I wonder if they're autistic?, because of the long standing and erroneous view (passed down the generations) that autism is a ''male'' thing.

Girls are socialised differently to boys, and this can result in them displaying slightly different autistic behaviour. For example, I had a strong interest in the actress Kate Winslet and babies instead of the more talked about autistic ''obsession'' with trains or computers (considered to be more boy typical by society at large). Girls might also be more passive and present as ''shy'' at school instead of loud and disruptive. However, it is also a case of what teachers, etc, look for. Even if a girl displays acting out behaviours or male typical interests, these behaviours might be explained away as her just being a ''tom boy'', whereas in a boy, the teacher might think, mmm, I wonder if they're autistic?, because of the long standing and erroneous view (passed down the generations) that autism is a ''male'' thing.

@Hope Hi  thank you for replying! I found it really frustrating when doing research that girls slip through the net so easily because of the gender stereotypes surrounding ASD. Do you think the diagnostic process is also too tailored to boys and men, as well as teachers having misconceptions of autism being something predominantly male?