This seems slightly disingenuous -- you can say (and think) whatever you like, but there are consequences for your speech, and freedom of speech doesn't shield you from those consequences. In this case, the consequence of being rude is that you will be ejected from the event. It's not substantially different from you cursing constantly at everyone: the organizers aren't required to listen to you use swear words all the time if they don't want to, and would be perfectly within their rights to ask you to stop and then throw you out if you refuse. You would be silly to argue that they violated your freedom of speech in this case. They simply heard what you had to say, decided it had no merit, and closed the doors.
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This seems slightly disingenuous -- you can say (and think) whatever you like, but there are consequences for your speech, and freedom of speech doesn't shield you from those consequences. In this case, the consequence of being rude is that you will be ejected from the event. It's not substantially different from you cursing constantly at everyone: the organizers aren't required to listen to you use swear words all the time if they don't want to, and would be perfectly within their rights to ask you to stop and then throw you out if you refuse. You would be silly to argue that they violated your freedom of speech in this case. They simply heard what you had to say, decided it had no merit, and closed the doors.