Thanks everyone for the input.
Thinking back on it I believe it was probably her little dog that caused her to ****z out so badly, it was a chihuahua sized dog and maybe she's had some close calls in the past with cyclists almost hitting it. I didn't get anywhere near her or her dog since I cut a wide swath through the grass but that's the only thing I can think that would have made someone freak out this badly. I have been riding my bicycle everywhere on the sidewalk for years and passed thousands of people but I have never once had someone so much as give me a bad look. I have passed numerous speed traps and have police drive by all the time too and no police have ever cared either.