Yes. He can try to stop me, just as I try to stop him. This is the game. It's an antagonistic relationship. There's nothing inherently "wrong" about either side - it just is how it is.
> You are not entitled to see the content.
If their server gives me HTML containing the content, it's up to _my_ computer what to render, therefore I am entitled to see or not see whatever is in that response.
I am very entitled to use of my own computer. They do not get to decide what happens once their content is on my end. If I were sending malicious code to their server in order to remove the adds or similar, you'd have an argument but since it's happening entirely on my computer, you don't. The entitlement to how my computer renders it rests entirely on me.