This is something that happened to one of my best friends (she’s 17). She’d just started an Applied Sciences course at college and she was the only girl in a class of 25. One of the guys who was in his early 20s came up to her on the first day and told her the only reason she got to do the course was because the lecturer was a man and that he must have felt sorry for her. When she asked why that was “the only reason” he said “Girls are too dumb to do science”.