Sarah Connor sure did a sh**y job of raising John to be some hero that'll be the ultimate human badass in the future. She was supposedly taking him all over, teaching him how to handle weapons, blow stuff up, hack things, and all that, and what she couldn't teach she'd have other's teach to him. If after all that time, she didn't teach him how to drive stick, she's retarded...
Or the writers are retarded... I'm going with the writers are retarded.