This should be "This should be 'You're thinking'." don't you think? Why bother correcting someone's grammar with a sentence fragment? You're just trading one mistake for another. I'm hoping someone finds a grammar error in my post, because continuing this would be hilarious.
Reflexively, I think it should be more like ...
javascript: `This should be "You're thinking".` ;
// to preserve the original character use and to avoid '...'...' parse foos
// however `"...".` also possibly deserves a [sic] to critique the original
// i.e. ~grammar police say the period belongs within the quote marks, no?