What should I do? A mall security guard forced me to leave my friend's parked car (friend was quick shopping)?

The security guard banged on the car door about 10 minutes after my friend had left and locked the car door. My friend promised he would be back within 20 minutes. The only reason I was waiting in the car was because I had intense nausea. I could have regurgitated at any point during that afternoon. The guard's exact words to that were, "It's not right to sit in a car. Go inside to the Macy's public restroom and throw up. Get out of the car AT THIS VERY INSTANT YOU STUPID EXCUSE FOR A DECENT HUMAN BEING. It's loitering. Hurry up you stupid idiot go inside!" I am very saddened by what happened today, and I need advice on what to do. I did not deserve to be treated that way,