Unfortunately, for every 1 guy willing to do this, there is 99 that will give her every bit of attention she desires and then some...
You ignore her, there's 10 others that will buy her a steak so you better look like brad pitt if you think this is going to work.
I dont know how to explain it. First off it's not what you look like , I mean you can't look like a troll but you have to 'think' you look like Brad Pitt. And you don't straight up ignore them , you have to notice them or at least let them just barely see you notice them but just barely and then nothing more. Then more often than not they start wondering why you didn't look more interested. Before you know it , if you allow the situation to present itself , they will start talking to you. But you stll have to be cool about the whole thing like it doesn't matter.
There's a fine line between "not giving attention" and blowing them off.