I don't understand when geeks insult other people who like Microsoft Windows or IE. I get it if you don't like the browser, I get it if you HATE the browser, but to actually insult the users of that browser is just ignorant.
Sure we don't have to use IE if we don't want to, but we still have to design for it. IE6 has a broken box model and more recent versions have been slow to keep up with new web standards.
If it was just a case of sites looking "less beautiful" in IE, that would be fine too, except that IE often breaks websites by not supporting certain CSS properties or Javascript functions.
The amount of work that goes into IE-proofing websites (which could've gone into more productive things) is huge. It's not just "hipsterism", a lot of these people are angry for a reason.
I use (mobile) IE voluntarily because it's the only browser on my preferred mobile platform. I have no complaints, it works as well for me as Chrome on my Android phone or Safari on iOS devices I've used.