I think another important factor in these discussions is the nature of beliefs that are supported by some.
For example, anyone who believes in a flat-earth, the re-establishment of slavery, beating women, that the Earth is the centre of the solar system, that children can give informed consent to sex, that Santa Claus is real, that a woman saying 'no' is saying 'yes', that African races are inferior, that Jews are evil and out to take over the world, that the Holocaust didn't happen or that a holographic projection of planes was the only thing thatb hit the World Trade Centre are idiots.
You may choose to express it differently, but I doubt if under the surface you think any different UNLESS you hold one of those above beliefs. They are 'no braners'; subjects that any reasonable person will disagree with.
There are some beliefs that the athiest group feel belong in the above catagory. Direct Creation and the Noachian Flood, for example. Those supporting those beliefs, as they use a different paradigm, take the grouping of their beliefs with those held by flat-earthers, nazis, pedophiles and rapists as a deep insult.
Yet when called to differentiate their belief with those of the above group they can not do so to the satisfaction of atheists - which insults them again.
Some people feel that people holding 'fringe beliefs' like Direct Creation and the Noachian Flood should be treated differently to those holding 'outmoded beliefs' like racism or flat-earthism.
But if someone is arguably an idiot for believing the Holcaust didn't happen, why are they NOT an idiot for believing in the Noachian Flood?
Importantly, most of us happily will describe JW beliefs in the most uncomplementary terms even to the face of those holding them. Why is is suddenly wrong to be so open about one's opinion when one describes beliefs that have a similarly shakey foundation as those held by JW's?
Obviously a lot of the classification is down to opinion. But to me there is often a double standard applied; ream the Dubbies but don't be too hard on the Creationists and Noachain Flood believers.
The VAST majority of Christians in the developed world hold beliefs that DO NOT fit into the group I have discussed above. Except maybe in parts of the USA (according to surveys) where literalistic fundamentalism is very popular.