i was not allowed to associate with non jw friends, this was a very strict rule, but i maintained non jw friends the whole time while growing up, i did this in school and on the way to and from school, some of these guys are friends to this day.
edited to add:
the hospitality shown to me by the parents of my non jw friends eventually brought home the fact to my parents that a lot of non jw's show far more love and acceptance than jw's do, and that jw's lack basic 'no strings' hospitality, and that is a big part of why my parents will now even call my non jw friends if they need a hand with something or in an emergency when i am away.