They started playing US basketball games on the TV here in Australia in the late 70s, early 80s. The Celtics featured regularly and they became my team when I got a sense they were the team other fans hated the most and most wanted to beat. They stopped playing games here and I had to rely on newspaper results and the interest around playoff time, until pay TV came along and I watched games in clubs and pubs and then on the net.
I have educated myself on the Celtics past (DVD boxed sets etc) and thrived on the hate of the big 3 era. The Truth was my hero for that period but KG was my ultimate type of competitor. I love the history and pride, but also embrace the hatred of other fans.