u/LuckkyWon is completely right. As a non stutterer, I can prove that every single person has something that bothers them to the extreme, even if it doesnt look like it. And most of us arent dicks. That girl happened to be one. And we (people in general) like teasing eachother. Meaning that we will insult eachother severely just for fun. It took me a long ass time to learn that they often arent serious. Dont give up hope. It will be fine.