Why do JWs seem to think all people are out to get them?

When you ask about their religion they get so defensive and accuse you of talking about them all the time. I talk about buy-bull fundamentalists way more than I talk about JWs because I encounter buy-bull fundamentalists more often than I encounter JWs. What's the deal with JWs victim complex? Now I'm tempted to taunt them like I taunt buy-bull fundamentalists. But I think it will offend their fragile egos beyond recovery.