It’s always good to remember that language evolves and thus you really don’t need to be a pedant about grammar (and as a former pedant, it feels really good to embrace the opposite approach).
TO and TOO were originally two forms of the same word. But because the adverb—meaning ‘in excess’, or ‘as well as’—was so often found in a stressed position at the end of a phrase, it gained an extra O in the 16th century. It has been considered a separate word ever since.
— Haggard Hawks 🦅 (@HaggardHawks) June 15, 2021