for many people, any size 6+ is already fat... and 6 is pushing it...
people like to brag.
why not brag about their current tapping toy? honestly, how many people have you known that pull out a picture of their fat girlfriend and start bragging about her sexy figure, her perfect "90-60-90" (and of course, if the digits were 110ish-60-90, it would be that much more better), and other things...
very few people brag about fat... and thats because all it takes to stuff your mouth with food... fit people actually take care of themselves and it is appealing. it shows control, dedication, and to an extent, health habits.