obesity is not a disease, it's a position where you have made the rational choice of eating too much food for far too long and are now too fat to function
"clinical obesity" is a weasel word that has been provided to fat cunts to think that they have a disease and therefore it isn't their fault and can continue to be fat cunts
it is not a disability, at all, let alone one that you didn't choose to get
you don't contract obesity
obesity can literally be cured (on the most part) by reducing caloric intake and/or increasing caloric output
there is no demographic that I have come across that is more obscene, immature and irresponsible than the obese who attempt to pass off their own misdeeds and shortcomings as anything except faults of their own actions
Businesses have the right to charge whatever the fuck they want, it's as simple as that. If Jetstar (used purely as an example) want to charge people over a certain bodyweight more money, then they will either get more money from those customers, or those customers will go elsewhere either on principle or for the sake of minimising their costs.