Definitely not a conference I'd ever attend.
A conference for technology is usually supposed to be a social gathering for people with a shared interest, not a formal conference like a business gathering.
The only thing I can't think of is that you submitted a lot of proposals and they perhaps thought it was spam, but the response they gave you they clearly knew it wasn't spam.
Perhaps they have small children's mentality and didn't like the challenge of someone with a different point of view and perhaps better knowledge; although that alone would be kind of ironic since most people go to such conferences to hear the minds of bright people.
From the information you've given, I'm unable to find a logical reason for your ban.