To be able to call someone, they must have sent at least one direct message to your account.
Emphasis mine.
To me, it seems like it means that for me to be able to call you, you need to send me at least one DM AND be following me. So, in essence, any rando that you folllow and have previously sent a DM to can call you.
Nah, man, you're thinking of 'stuck'. Stoic is what you do to a burning pile of wood or coals to keep the fire going.