In his battles with the academic left, I am sure that Silverglate has heard that line many, many times. That line is very popular with the PC types on campus when they try to justify speech codes.
So, once again, using your 'logic', do I have a right to argue loudly with my wife in the front yard at midnight? And to ignore the requests of cops to knock it off or take it inside so it won't disturb the neighbors?
You insist on ignoring that key aspect of the situation. Which tells me you are being dishonest in your approach here - it was NOT about Gates being rude to the cops, it was about the manner in which Gates was doing such, and that Gates was warned twice to chill out.