In my JW ingrained Mother's words: "Shunning someone when they are disfellowshipped is a way of showing love for them. We show them how much we want them back in our lives and how much Jehovah wants them to do right and come back."
It is really twisted reasoning, but that is probably how this brother feels. He probably feels that shunning you is loving and the best thing he can do for you right now. I know it is hard to get a handle on but this is how many old-timers feel. Try not to take it personally.
By the way, you should see the look on someone who is DF or DA when a member in good standing goes out of their way to talk to them, like I do. I sucessfully faded, but most DF'd don't know that so they are completely shocked when I run over an isle in the Wal-Mart to speak to them. I have never been good at shunning people.