That's the problem. You can never be too sure. If anyone tells you, "you ride small bike, why you where full face". Just smile at the person and say you like it, there's not much of a point talking to someone whose level of intelligence is non-existant. Riding a small bike doesn't mean you won't get into accidents. And don't think scars are cool. That's plain stupid.
I'm riding a 125cc bike but wearing a full face too. Don't worry about what people around you say. There'll be someone having the last laugh, and when you see who's laughing, you'll know who was wearing the full face