You are right. It is OK to disagree but to call it stupid is counterproductive. The JWs call the World "under the influence of Satan" which is negativity and it won't work, imo but it isn't right to give it back the way they give it. I can see people ignore them which doesn't work either.
I have been trying to give them a positive spin on some scriptures but they don't like that.
I imagine it's pretty hard if they see you as an outsider. A number of the religions I got involved in were very antagonistic towards ex-members. Most had some rule to no longer associate with ex-members.