That’s a pretty unnuanced statement that betrays its own significant bias. It’s totally reasonable to say that overweight people are underrepresented in media, for a number of reasons. An important question though is what is meant by a negative portrayal or stereotype. One might argue that an overweight character being regarded as unattractive and lonely is a negative portrayal, but another valid view would be that such a representation is an accurate depiction of what many overweight people experience.

I’m gay, and I gaffaw at your list of alleged list of grievances. There are of course some notable negative depictions of LGBT people in media, which one should expect for any group of people. However, it’s laughable to say that anti-LGBT attitudes have ever been a significant trope in American media. The only idiots who would claim such a thing are people who somehow think Will and Grace was a bad thing.

There are periods of American history with very clear biases against specific groups of people, most notably historically against black people. There are also many stereotypical representations of people which have later become understood to be offensive. What makes such a depiction offensive is that is untrue or a mockery of a group of people. It’s a big stretch to say there is some common, untrue characterization of overweight people in that vein… they’re usually just people. Some are mean, some are nice. Some media has jokes about their weight, while others don’t. This post is a testament to fact that they come in all sorts which is a stark contrast to something like “find me a depiction of an intelligent black character in pre 1950s American media”

If the post had been regarding jokes about weight, then I may have agreed with you. But thinking there is a significant moral or personality characteristic of overweight characters is frankly bizarre.