I have mixed feeling on the subject. If security (someone who is doing their job) is kicking you out, just leave, it is easier on everyone, doesn't blow up the spot, and it will be easier to just come back later. Don't destroy anything at someone's house (those hill bomb gap bump things in SF or similar spots are an exception, no property is being damaged). On the other hand, if you are in a public setting and some random person is getting in your face about skating they deserve whatever happens within reason, getting knocked over, bumped ect.