When is a Protest no longer a Protest?

I've been having a lengthy discussion with a girl else where who was involved in one of the G20 peaceful protests in Toronto during the weekend. I had made a comment to a journal a good portion of the mess that went on there, especially the violent one. I am fine with peaceful protesting but not so when things turn ugly. Another girl comment in a very radical manner, countering my argument. The conversation almost didn't happen because of high emotions on both sides but we did manage to clear that out of the way, each point blame at either side wondering who was at fault. May thinks came up such as trust in the human word, free speech, human rights, criminal justice but more or less protesters. She then showed me two videos taken that day from the protesters POV. I watched, made my argument and am now waiting on a reply. That being said though, I did think of another question. When does a Protest no longer become one? It's a question I plan to pose to the girl.

When I saw those videos I didn't see a 'protest'. I saw people taunting the cops and singing the anthem. I didn't hear anything towards rights being said by the people, I heard questions and insults. That's not a protest to me. To me, you are saying and showing what you actively believe in. You are doing it in a peaceful, no destructive and tolerant manner. You aren't bellowing out in song and sitting in front of police lines knowing and actively making yourself a target.

So when does a protest no longer become one? I know others will have different views on this and I'm curious.