I'm sorry you're going through this Todd. Like I said, it is confusing on the website, where you think you might be signing in to the website, but it is asking you for your email address and password.
I'm surprised though that people would complain to you. All they have to do is reject your invitation - and they should stop getting those emails. I do with requests from people that I don't want in my network (like my competitors). Usually, once you reject it - the requests stop coming. People get junk mail all the time, to try and complain about it - seems like a waste of time.
I understand though, why you are put off by the site.