If you don't have at least one "weasel" friend, you need more friends.
If you don't have any weasely friends, you just may be their weasel!
It is possible to both have friends you would trust with your life and friends you wouldn’t.
The latter are acquaintances.
That as a distinction between friends and acquaintances isn’t necessarily crazy, but it certainly is not how the word friend is used in practice, so this is a weird thing to insist upon.