That's definitely a rough place to be in with the auto high beams, sorry to hear that happened to you.
There are apparently a few ways for the "IntelliBeam" lights to not work effectively, and your situation is one of them.
gmauthority.com
There are apparently a few ways for the "IntelliBeam" lights to not work effectively, and your situation is one of them.

General Motors IntelliBeam Technology
IntelliBeam is a General Motors lighting technology that automatically turns the vehicle's high-beam headlamps on and off according to surrounding traffic conditions. How It Works IntelliBeam turns on a vehicle's high-beam headlamps when it[...]
