This is the question I have as well. Personally, I do think Bitcoin is ultimately the best cryptocurrency BUT I also think privacy coins like Monero are phenomenal, and even some Ethereum-based blockchains like Polkadot (the ecosystem, not just the core blockchain) and Solana also have legitimate use cases.
Bitcoin maxis aren't 100% wrong but they're also not 100% right, in my book. Frankly, I don't understand why some of them get so bent out of shape over others using other coins... I mean, sure, if you believe that it's a bad idea to use anything but Bitcoin, go for it: tell people why you see things that way. However, that doesn't mean that the cultish attitude is even slightly necessary.