I'll voice it in a way how I read it at first, though addy does have a point as well.
PS: If you ever have enough gall to prove to me that you are not a coward, please, do so. And I don't mean behind a computer screen where you have absolutely no chance of physical harm.- This obviously refers to something in RL, no? Physical harm. That usually has to do with violence, one way or another.
Try doing what I do, and then talk to me about cowardice. - If you refer to your job, it gets a different meaning. But why should picking a different way of living be..cowardice? You yourself also said it, you aren't exactly in the dangerous parts of the world. When I first read it, I understood it as: "Make everyone around you a really hated enemy and then go meet them IRL, possibly starting a big big argument over something and get into fight." Thus, violence.