Rude Security Guard at the Main Entrance

At 16:15 today, I arrived at the main entrance of the University. I politely told the security guard the reason for my visit and what department I would be visiting.<br> <br> Completely unexpectedly, he then mocked (?) me in a rather rude way by imitating a female voice and saying, \Oh? OK...!"And then he added: \""You look tired!\"" (Perhaps there's video footage available as evidence?)<br> <br> Could you please explain to me why I was treated this way at the entrance of one of the top universities in South Africa? I obtained a Master's Degree from Tuks in 2009 and I do not want to be addressed so disrespectfully on the rare occasions nowadays when I visit my alma mater.<br> <br> When I left through the gates again at 17:05"