I must admit, I've never seen a fat biker. However, I've seen plenty of fat runners(or "joggers"). You gotta admire the efficiency of the exercise. However, I hate bike riders who do not stick to the sidewalk. On the road, they are a huge nuisance and probably cause plenty of accidents.
On a side note, do you have one of those ultra cool biker uniforms or are you just some average joe who rides his bike without style.