Seems like a blatant troll, but anyway, I'll bite.
No the website has no RIGHT to know about screen size and so on, but that kind of information IS useful to a designer/programmer. If there's no room for a sidebar on 60%+ of my user's screens, then what's the point in having a sidebar. Conversely if 60% of my visitors browse with the browser maximised on a widescreen monitor, then maybe I should give them something to do with all that extra space.
As for proxies... maybe you haven't worked in the real world, but most businesses operate an Internet proxy and many ISP's route their users through one as well.
As for "what people don't like: "attempting to monetize a website""... servers, bandwidth and time aren't free... well not in the real world I inhabit anyway.
Enjoy your free, hobbyist Internet... I'm sure you feel dirty every time you shop online, post on Slashdot, or read anything that isn't someone's shitty two penny blog.
The laugh here about "monetizing" is it's very often congruent with giving your users more of they want and better targeting ads, so your users spend more time on your site and click on a larger number of ads they find interesting.