I've worked with customers for years. And there's nothing more infuriating for a female than to be ignored. Not in a "you don't exist" way we guys are treated, but in a "you are the same as everyone else" way. Make them feel that they're nothing special. Negative attention is attention too. A dog destroys a pillow and gets yelled at. That gives him attention and validates his existance. Women are exactly the same.

I'm unattractive. I've always known that women act flirty or happy just to get a better deal from me. My woworkers always flirted back, laughed etc. I didn't do that. They're not going to fuck me. So why should I act like they would? I treated every female customer exactly the same as I did with a male. I ignored their physical appearance because there's no access to the boobs. I can look at boobs online. And every single one of them stopped smiling. Especially the older ones. Some got outright mad and frustrated. How dare that ugly guy ignore them? How did he not kneel down and praise them?

Try it out with your wageslave coworkers or customers and watch their reaction. Being ignored - especially by ugly guys - is the worst punishment for them. Insulting or hating them just gives them attention. And attention is everything to females.