Well, Beat, I did tell you mono women will generally not appreciate being approached by a married man. If you search for poly in the keywords, you might be a lot happier with the results.
To be fair, she may have spoken a little rudely, but that's the internet for you. Oth, there's no reason, really, that she should understand there's a "difference" between swingers and poly. Most people aren't going to know anything about this and even swingers and polys still debate it.