Depends on the jurisdiction and circumstances. In my country filming someone without their consent is also illegal. In a situation where someone feels violated in their privacy, when words didn’t work, force may be required. Advocating or not, it’s likely going to happen. Pointing a camera at someone‘s face obnoxiously tends to escalate situations. Mix alcohol, testosterone and happenstances and you got yourself broken glasses. Try that with a phone camera today and report back.