It's not in any way morally equivalent to theft. To say so shows extreme ignorance. It's not theft to record my tv shows and skip the commercials. That argument was tried and lost. Ad block is just commerical skipping.
If you don't want to display your site to people running ad block then don't display it. Don't lie and make false equivalency.
Yep. Which is why Adblockers should be illegal. Brave should also be illegal. In fact, Brave replaces ads on websites with their own ads, even worse.