Here are a couple more charts. Firstly, to show even Americans still use and more often than not...
And secondly, to show that Brits remain impervious to such pedantry...
Personally I think it's potty to rant about one or the other being more "correct", and it's positively disturbing to see people thinking this leaves scope for confusion between 120 and 100.20. I don't know who thought up dropping the "and" (though Noah Webster has "form" on such issues), but I'm sure they'd be aghast to find it's apparently led to more misunderstandings, not less.
TL;DR: Go with the usage you were taught, but please don't assume others are wrong.
On behalf of the Brits and Walt Disney, I must just say I never heard even an American refer to One Hundred One Dalmatians.