The burnout could just be a bad attempt to look cool in front of his 16 year old son. Same reason probably why he let you drive it at 16.
If you've been borrowing the SUV / jetski for a while, you owe it to at least give him a chance to borrow the car despite the assumption of abuse. Just talk to him before hand. If it comes back with signs of abuse, then cut him off. My 2c.
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