Can I screw up a job under the bosses instruction?
Are you serious, why do you want to intentionally sabotage the job?
He's just mad that I didn't agree with every single bit of his idea.
I hear you, but it is wrong to sabotage a job just to prove a point. You should always do your job to the best of your abilities. Otherwise your boss might find you incompetent and fire you.
He might fire me but, I will get the last laugh at the end of the day. He will admit that I was right about everything.
Laughter is not a good way to pay the bills, so you shouldn't mess around your job. Also depending on your job, you could be hurting the client too which is not nice.