You've discovered that your new significant other has a pretty icky habit...

…you don’t really feel like it’s worth ending things over this habit, though it is pretty icky and you can’t really overlook/ignore it. What do you do?

I’ve got no intention of disclosing what this habit is, but suffice it to say it’s something that little kids very commonly do, but are generally taught not to do that fairly early.

I’m really really really stuck here. Help?