I was a security staff member at the con. I did not see any evidence of this type of rampant rudeness. For the most part, the crowd was very respectful, and, in my experience, anyone who was doing anything like what this post mentions was dealt with properly. I can say for sure that the person mentioned who wanted to "purchase pornography" was kicked out of the con.
Everyone should keep in mind that we are not omnipotent, and as such some of this stuff will unavoidably fall through the cracks, especially with a fandom that is enthusiastic and varied as this one is. I can say with 100% certainty, however, that this post is exaggerating or fabricating any problems with the con.