I was all for it until you mentioned his dinner. At that point a line was crossed!
This guy does nothing to deserve our sympathy. He was on the school grounds, using the school's tennis courts after being specifically told he did not have permission to be there. Then he decides it's a good idea to plug into the school's electricity to get a free charge for his car. What kind of thinking allows him to do that? And when he's called on it, he gives the cop grief.
He knew exactly what he was doing, and he knew he had no right to that electricity. We only have his word for it that it was only 20mins charge. He could have been doing this every day for weeks. Anything that happened to him is a result of him purposely being a dick.