The external effects of large pickup trucks are drastically more than that of a small sports car, in ways that are more immediate than climate change.
Large pickup trucks take up a lot more space on the road and parking lots, are harder to see around, and when they get into accidents they cause a lot more damage and injuries to people both in and out of cars. There is a very different visceral response to a large pickup truck tailgating you with its driver perched above you, than a Lambo or 911 doing the same.
I think it's a strange argument: that buying a truck is "worse" than buying a sports car. I think the term "apples and oranges" is applicable here. The former are both vehicles and the latter are both fruit, but otherwise have fairly different cost/benefit.
Large pickup trucks take up a lot more space on the road and parking lots, are harder to see around, and when they get into accidents they cause a lot more damage and injuries to people both in and out of cars. There is a very different visceral response to a large pickup truck tailgating you with its driver perched above you, than a Lambo or 911 doing the same.