Is it time to start calling out bad cyclists?

I was going about 16-17 mph (max - I'm quite weak) down the Chelsea embankment this a.m. Lots of over-the-shoulder checking as you can imagine and I find some dude on my back following me left and right. Look back 3 or 4 times and he's still there so I turned around and pointed right in his face and yelled at him to GET OFF MY WHEEL. It worked, but I think I used the same intonation as GET OFF MY LAWN which I just don't know about that.

I find blowing my nose as effective passive aggressive method