What is the DEAL with people using Internehts Explorer?

I actually have one friend who is very stubborn about their insistence on using Internet Explorer (for reasons they won't specify) and they gives me a really hard time for using Firefox. It is actually very refreshing in a contrarian kind of way, to find someone who stands up and defends an unpopular clunky old worthless browser.

Reminds me of when I was still using an old black and white Nokia phone while everyone else was getting their first smart phones, and I'd argue how much better mine was. People would look at me like I was cute for doing so, but we all knew I was being an idiot and was merely attempting to be different (or as I prefer to think of it, holding back the night, as it were, avoiding technological dependence. Behavior that gets me some amused smiles and pleasant attention from time to time, but no one really takes me seriously.)