Most swingers feel like anything that isn't purely NSA (for example - a couple forming an exclusive, long lasting sexual relationship with another couple even if it isn't loving or even based on friendship) isn't swinging. Also, swinging tends to be VERY couple-centric so solo people don't tend to get much support in difficult situations.
Just a couple of reasons people some on here would consider swingers may relate more to polyfolk than self-proclaimed swingers.
There is this weird space between what swingers call swinging and what poly people call poly, and I think that's where a lot of the topics that some don't relate to on here come from. I fell in that space for a few months.