I like fat chicks too, and I've dated several, ranging from barely chubby to over 400 pounds. However, even among those who consider themselves BBW, I've yet to meet one who was really confident or comfortable with herself. Why do you suppose it is that some women who are knee-deep in fat acceptance culture STILL don't really accept their bodies?
Because fat acceptance culture isn't the culture at large. In the real world, it sucks to be fat, and no one, not even thin people, have nerves of steel. Fat acceptance culture is great for letting people know there's an option of acceptance, that there are people besides your own self-confidence who will validate your beauty, that there are men and women who are physically attracted to you or desire your body type. Sadly that only goes so far.