While I think the monotheists are the most outspoken (and easier to get behind), I don't know whether the overall point is true. Continuing the purely anecdotal style of the OP: I know a lot of people that might fall into the monotheist camp at first glance, but once you start talking, it really isn't true. In my circles, I can quickly name the following configurations:<p>* The all-out Mac/IPhone user that is constantly eying for B2G and some Linux desktops to finally hit the point where he wants to switch.
* IPhone users complaining that Windows Phone hasn't taken off.
* Windows users using OS X at work and being pleased by both...<p>I could go on and on. Once you start talking to all of those people, they will happily admit many advantages and flaws of their platforms. The problem is that once you picked one, people automatically assume that you dislike the other. You won't talk much about the nice little things of a platform that you don't use on a daily basis.