It's my computer, not yours. The browser is my user agent, not your server agent. If you don't want me viewing your page according to my preferences, then the world wide web is not the right medium for you to be working in. Go write a native app and try to convince people to install it. Once you serve up the contents of a web page to my user agent, you have consented to letting me digest that content however I want.

This is not a sense of "entitlement", it's just the fundamental reality of what the web is.