I am seeing this more and more these days, people saying or writing disinterested when they mean uninterested, and it really annoys me. I was brought up and taught that disinterested means impartial or unbiased, and uninterested means that you're just not interested in something. The other one is the 'font' of all knowledge instead of the 'fount' (unless, of course, I've been saying it wrong all my life!
Bought the wrong Hot Cross Buns 😩