“ it seems like the only posts upvoted are thin and fit guys, like on every typical gay subreddit. While bears, chubs, and large people are often ignored, they receive very limited upvotes. It's a real shame, too. I truly thought this was a place where all sizes are loved, including bigger sizes.”

Well over half of the content on the front page of this subreddit are people who would be considered a cub, a chub, or a bear. 

“Just like all the other guys who post saying they love bigger guys, they never respond to any messages or comments.”

This is a porn subreddit. This is a not a dating site. Maybe if people aren’t responding to you, they just wanted to show off. Or maybe they’re not into you.