(I apologize in advance that a lot of this problem I describe is heavily influenced by class and white-skin privilege. Being able to travel is an economic and political privilege, and there are also reasons other than weight that people may be gawked at in this way, some of which invite a greater threat to safety)

Thin privilege is, regardless of your politics or actual nation of origin, not being used as a comedic symbol of American excess. It is being able to go to another country (or be around tourists in your own country) without people taking pictures of you as a national stereotype. It’s not being afraid to return to your country of origin, get your TEFL, or take a job abroad because your body will be the subject of a joke in any of those situations. It is being able to go on a study abroad program and pursue dreams and goals of a fun fling, and not worry about being verbally harassed by strangers because of your physical form.