Bluetooth + cars = chaos

Googling / AI hasn’t helped with this. Not a major issue, but quite annoying.

My wife and I both have newer Toyotas. I’m in my car every day, and usually connect via wire so I can use CarPlay.

Context - We’re commonly following each other - she leaves at the same time in AM when one of us is dropping kiddo @ daycare, following me home from dinner where we’ve met up after work, etc.

Annoying part - I’ll be connected to Bluetooth or wired CarPlay in my vehicle, and if her car gets within 10 ft of mine, it transfers it over. It’s annoying when I’m listening to music, and really annoying when I’m doing a work call on an AM drive and suddenly she’s talking to my client from her car.

I haven’t found anything about how to resolve it. Is there no way to disable auto-connect for her vehicle without removing it from my remembered devices entirely?