If he spelled flavor as “favour” that would be a very alternate spelling indeed. Gaudere’s a bitch, right?
However, spelling favor as “favour” is perfectly correct, it is the proper English way, not your dumbed-down colonial cod-Latinate spelling.
Noah Webster was a dumb-ass (not as batshit as Franklin, but a dumbass all the same). Use his spelling-for-babies variant if you must, it’s your country. But don’t be such a stupid sack of pus that you think it’s the only correct way.
Ooh, high humour with a certain nonnie flavour. Always a favourite, DrDumbth!