daniel,
Teens seem to be under a lot of peer pressure and so many want to be like their buddies or just be tough guys.
IMHO, you did nothing wrong and this guy needs to be booted out of your life as he is not safe for you.
Although bullying is something that has gone on for generations, in recents years, school boards have begun to realize what a serious and pervasive problem it truly is and have instituted zero tolerance policies.
Whether you are 16 or 60 it is hard to understand why people all of a sudden "don't seem to like you", so hold your head up high and know that things will get better.
Kindly,
Kitt