Yes, I'm aware it's not universal. I can't really explain why it's so bothersome - it's similar to occasional words being in a bright colour, or someone poking me every so often while I'm trying to read. It's probably a pity because, combined with my laziness, it just means that I avoid reading writing with lots of italics. If I'm feeling particularly motivated I'll modify the text to remove all the italics before reading it.