I didn't notice it as much in high school. But ever since I've been in college, every girl will call you a "creeper" just for approaching them or "weirdo" or some other immature word. Most of them tend to be shallow prudes who wouldn't say this to a guy loaded with money. It's depressing too since I was popular with girls in high school. I honestly find myself missing high school more and more.
It's not solely college women. This is an issue I see with women under the age of 30 in general. I'm surprised you didn't notice this in high school either.
Even when a guy approaches a girl respectfully or with charisma, he will still be labeled a "creeper", just because he's not privileged enough to shower her with gifts or doesn't have a high paying job. These same hypocrites will complain that guys "never" approach them, when in reality, they turn down every guy who does.
The young, modern day woman (for the most part) is a shallow beast. It's no wonder there is such a "cougar" trend going on these days.
Not saying this applies to you or not. But an observation I've made is when a good-looking, sexy guy approaches a girl and she is attracted to him he is seen as confident and cool. But if the guy is not good looking/shy and she is not attracted to him and he approaches, he is seen as creepy.
It's messed up if you think about it. But it's how it is in my opinion.