Then I woud say yes it is your fault! You have nothig to defend your work! And always have the customer sing-off on artwork(redraw or not)!
Take the exacto knife out, and trim to match. Done.
I think he is more bothered by the fact that he couldnt put a decal on his $48k truck straight, and wants to make sure he has backups to try it again.
Good eye. That decal there is ALREADY INSTALLED. Poorly too.
he should be more bothered that he has a "$48,000 truck" that only runs mid-13's.