i don't want to use the term brainwashed. but maybe, not open minded. the popularity of bitcoin usage can't really be overcome by most projects that are offering more benefits than bitcoin. truly, there are several projects that were created to be much superior than bitcoin, however, they can't compete with bitcoin because as you said, they are not open minded people. we want to stick with btc as much as we are stuck in using USD as the global currency. if you know someone who is not into crypto, if you ask if he has any idea with crypto, and the first thing that will come up to his mind, is bitcoin. all the other alts are just secondary or most of them don't know their existence.
I think I would say open minded is a really tough thing to do in this space. Brainwashed is probably too harsh,,, but a lot of crypto people are a bit closed minded to say the truth or to see things correctly. Superior in technology does not mean much if it is not superior in security or superior in development like Bitcoin is.
All alts are in theory better than Bitcoin but when you see in reality how they all get hacked or all get controlled by founders, then the truth is known.