Good point about Bitwarden, and the more we can convert the better. I think we can catch more fly's with honey than vinegar.

What do you think about trying something like, "Good points about using a password manager. I think Bitwarden is better than 1password becuase it: is open source, it can be self hosted, and you could switch to a fork if they get shady."

Because you wouldn't be implicitly calling them ignorant this way, they're more likely to hear your message.