There is an old idiom (at least I believe it is considered an 'idiom'):
"There is no accounting for taste".
Trying to force someone to have a specific viewpoint on a piece of art, a sunset, or an operating system seems a bit silly.
We all have to live with and use the system we choose, and we all have the right to use the one(s) that we like. I for one would love to know all the platforms, but I simply do not have the extra money to go around purchasing a bunch of machines to learn them.
I use a PC because that is what I have at the moment, and for which I have purchased software (not a modest sum for that, either). Taking personal offense to someones viewpoint on art, a sunset, or an operating system (as long as they are not forcing the issue on you) is silly.
I have to agree that the personal attack quoted in the opening statement seems out of order.
As long as we are enjoying ourselves, why bicker over which operating system the other guy is using or believes in?