I am so sorry for your loss. I lost my father 4 years ago. He was a JW for many years as well as my mom. All of the Witnesses who came around were very friendly to me and I appreciated it.
I think you have to understand that no one really knows how to act when someone passes away. I have found that if I just try to impune the best motivation of others and assume they were trying to do the right thing, it helps me not be bitter.
May God bless you and your family and provide strength during this stressful time.
Sincerely,
-Andrew