In the current society, the perception of most people dyed in the wool, that fat people are ugly, lazy, unattractive and sweaty. Those few extra pounds are no longer a personal matter to be sighed over in the privacy of the bedroom. They are a social problem which, it is said, need to be worked off together.
Speaking from my own experience, we can often see such incidents in the MRT train. I once saw there was a big sized guy, almost twice my size was sitting on one of empty seat in the train. Due to his big size, he almost occupied two seats, leaving a tiny space for other passenger. During that time, it was the peak period( after working hour), everyone looked tired and frustrated of having to squeeze with so many passengers. Then, few of the passengers started to give him a 'dirty look' and kept staring at him from head to toe which made him so uncomfortable. Then, there was a young adult who was standing in front of him, covered her nose with a frustrated face due to the smell of that guy's odour. What happened next was that big sized guy immediately alight at the next station without looking back.
One reason why prejudice against fat people is stigmatizing in our society or even in Singapore is because people especially new generation place great importance on physical appearance. They tend to have a certain perceptions of the outgroup and give certain treament to them because they are so called 'not the same' as the ingroup in terms of appearance and those in the out-group are more similar to each other ( although that is not always the truth). Individual tend to judge another individual based on first impression or the use of schemas for the fat people and social categorization. This is happening even in a love relationship eg. love at first sight. Do you really think what first capture/attracts a guy/girl's heart is the personality of the opposite sex, and not based on the appearance? Personally, I don't think so. Although when you asked that individual what you first like about him/her and usually he or she will replied by " Oh, I like him not because of his look, but because he's such a caring guy". Yes, maybe that guy is really caring towards the girl but we need time to get to know our partner well before we could label him as caring. Therefore, the first impression is usually based on appearance. This is something like modern racism where people learned to hide their prejudiced attitudes in order to avoid being labeled as racist where people outwardly act unprejudiced while inwardly maintain prejudiced attitudes.
For many of the growing numbers of people who are overweight or obese, the immediate battle remains not one of losing pounds, but of fighting for acceptance from the society. One of the ways to stop prejudice against fat people is is to redefine or break down the ingroup/outgroup boundaries. We should discourage categorization and encourage personalization and if there is categorization, we should accept them and treat them with mutual respect, and not to treat them differently.