This is extremely specific and it makes me irrationally furious:

When people are writing they'll put a placeholder, e.g. "I went to [location] with my friends." Sometimes instead of the square brackets they'll do carrots ("we went to <location> together"). At some point the internet collectively became aware of the fact that this looks like an HTML tag. And of course, if you're a very special smart kid, you need to show off the fact that you know it looks like HTML, and in your very special smart rudimentary understanding of HTML, tags always need to be closed! So now people do this -

"We went to <location> together. It was a fantastic time. The food was great. </location>"

Oh so clever! Oh so smart! Except if you ever actually used a markup language you'd know that this means that you formed an element called "location" which contains the data "together. It was a fantastic time. The food was great." Which is very stupid and not at all how HTML works.

All people had to do was go <location /> instead. But no. We're running with this forever and I will never stop being angry.