Hamish Durie said:
Here's a tip for what to do next time some crazy person tries to talk to you:
Do what they say that you're doing wrong
In this case, you watch the crazy lady in the eyes, take a big bite of steak and go "mmmmmm, this steak is so gooooooooood, I can almost taste the soul of the cow, mmmm mmmmm mmmmmmmmmm."
I did that once myself when some crazy vegans tried to force their way of life onto me.
Passive aggressiveness goes along way when you're in public since you won't do anything wrong, but end up pissing them off.
Also, it's bloody good fun.