Tell your boss you’re sorry for leaving early and you have some “stuff” going on at home but that it won’t impact your work schedule anymore. If coworkers bring it up just ominously repeat that you’ve got some “stuff” going on. Maybe you just lost your dog with cancer, they don’t know and probably already assume your reaction was about something more than spelling. Laugh off everything else they might say.
PS: I have a masters degree and still can’t spell well in English— it doesn’t have a consistent phonetics.
Whatever adjustment needs to be made it clearly shouldn’t involve repealing these protections. Litigious bullying surely doesn’t surpass burning women because they didn’t give your family enough money when you married them.