I used to use Comic Sans all over the place, even though I knew it was frowned upon. I did it mostly to piss off my designer friends and colleagues, although probably initially just because I liked it when back then when there was not much choice.

I don't use it anymore as I can't be bothered to annoy people on purpose anymore, and nowadays there is not much effort needed to find a nice google font etc.

Although I do still like to argue about tabs-spaces, curly brackets, pragmatic-mathematic etc.