Ummm I would say no to the original question. It depends on the person. Some fat people are humane and decent and some fat people are inhumane and horrid. Just like thin people or in between.

All I know is that I've been fat/thin/fat/thin throughout my life.

People have been nice to me & rude to me - throughout my life.

I've never assumed it was or wasn't because of my weight. I just assumed if they were nice to me then they were a nice person; if they were rude to me, then they were an a$$****. :D (Or maybe just having a bad day!)

I noticed people are nicer to the thinner me as well. I remember in stores I would have to run around like a chicken with her head cut off to get some help.. and then they take forever to help or forget about me.. Now people all the time come up and ask if I need help -.- WTH is up with that! LOL.

I also notice the door thing as well.. mostly guys will open the door for me, let me go through first.. etc.

Unfortunately we all still judge by it's cover. It's how humans work.

For me it depends on my mood, I can be approachable or not. A lot of people who know me now all say the same thing. "When I first saw you I thought you were a complete *****" and I'm not heavy but I'm not really thin either. It's how I am, I take a while to like anyone. I observe you first before deciding if I want to speak to you or not.

I am far less approachable now than when I was thin. I do not think this is because of weight, though. However, when I was thin I did have far more confidence and was outgoing and ambitious and that meant I was more in contact with people because I was open and friendly.

Events happened to change that. I closed off and became reclusive .. then the weight piled on.

My partner and I discuss this sometimes because most of my social interaction is via the internet and gaming and, even online, I am either not noticed or disliked. The assertion is I say things differently or more bluntly than other people, without the conciliatory body language or facial expression to mitigate what seems harsh in my words. This could be down to the fact that I practised psychology and tend to not play word games or it could be down to the fact that I ended up just not trying very hard to get people to like me.

However, the dislike is not down to me being fat, it is down to me not being "nice". (which my partner assures me I am!)

Ah well, my cat likes me ... almost.

I can't say because I was never obese but people are only nice to me when I am 'in the mood'. I can put out a really stand-off ish vibe and people just don't approach me or try to converse with me. But when I go out and try and be more open people all at once are more open to me too.

I won;t argue that there's some sort of social misconception regarding weight and the friendliness of a person, but I think the way you behave is such a big influence. Like one poster said, a lot of bigger people try to 'compensate' by being extra nice. When you are extra nice, you get extra nice responses.

Then there's always the odd chance of bumping into people like me that when they have decided to not care for a soul this day will not smile at you no matter what you do. LOL.

No, because I project my own struggles with my weight onto them and suspect they all have binge eating disorder.

I've been on size 8 to 20 and the only difference I noticed was men seem a bit nicer and more willing to help (like hold a door) when I've been thinner rather than heavier. I have met this unwanted male kindness with being colder to men (I'm a a happily married mom of 2). When I was heavier, I was nicer because there seemed to exist this understanding that there was nothing in the way of flirting going on because I was fat, and they were not flirting with a fat girl.
Now, I feel like I can't have a casual conversation with a guy like in line at the 7-11 without them being too whatever it is when they get all up in your space annoying. So, I try to dress sloppier and not be as nice to men. I know that sounds weird, but I spent most of my life being fat and being "the friend" and I'm used to that. Its comfortable hanging with guys knowing they are NOT thinking any unpure thoughts.
But with women I'm the same person.

I think it has everything to do with what one projects, if you're feeling confident and happier I believe people are more likely to pick up on that and respond in a friendly manner. Other other hand, if you're feeling insecure and ashamed and have little respect for yourself, it would come as no surprise if others do not appear to be respectful and kind.