The meaning would depend on the context. Eg., Two women talking about their girl friend's exe husband. "Jim was just a slob who wanted his wife to be just a maid. Yeah, he is a typical guy." Or, eg. Two men talking about their friend. "Can you believe that Fred is 50 years old and still wants to play hockey? He is a typical guy."
Harry was simply pointing out that different people can have different definitions of what is "common" for someting in particular (a group of women might have a very different idea of the "typical guy" than a group of men), therefore "typical" or "common" can vary based on the context.