"What a joke he is."
Bubba Wallace was NOT a happy camper after crashing out of a race Wednesday ... the NASCAR star went OFF on fellow driver Michael McDowell after he says the guy purposely wrecked him.
Here's the deal ... Bubba had been gunning for weeks to get a spot in NASCAR's All-Star Race at Bristol Motor Speedway in Tennessee on Wednesday night.
But, since Bubba hadn't won in 2019 or 2020 ... his only options left for a spot were to win one of the stages in Wednesday afternoon's All-Star Open qualifying race or earn the fan vote.