I might be wrong, but I think that it is a stretch to blame it over obesity. It is more a question of attitude. Perhaps you are too shy or they are a group of independant people. IMO, continue to be courteous and talk to other people about your experiences, your opinions and avoid to focus only on subjects that can be potentially perceived as obsesssive, as weight management. You were determined enough to lose all this weight, so I am sure that you will find a way to make your social relations more relax. It is your ball. Just my 2 cents. Good luck.