Okay, so let me preface this by saying that SO is a clean, hygienic guy.
The other day we went on a trip and I forgot my toothbrush. "No biggie, use mine," he says. I told him hell to the no. You don't use someone else's toothbrush! So disgusting! He didn't seem to see why it was so gross, and ever since he'll bring it up in conversation randomly. I actually think he might be a little butt hurt that I won't share with him. It makes zero sense, because 1) I already explained my reasoning behind it, and 2) he is normally not a guy who gets butt hurt.
Fool, we eat, drink, and sleep together. We do not need to share a toothbrush too.
What are some WTF things that your SOs/FIs do or say?