Those two words have different meanings to me. The foodie revolution was when young, ordinary, nongourmet folks started getting into food. The eighties. Gourmets we have had with us for a long time.
I understand there is a difference, but “foodie”, “hoodie”, the ‘90s term “hottie” (for men) are all diminutive nouns. Their usage usually is meant as a subtle put-down of the item or person in question (compare to the ‘70s “trekkie” vs. “trekker” debate), or the superiority of the user over the said item.