What would be particularly bad about running a real time application like that on an Arduino? Isn't that what they're made for?

Arduino boards arn't designed to operate in a rugged environment such as a car which is a pretty hostile environment regarding vibrations, electro magnetic interference and thermal cycling.

Arduino is not real time.

Sure it is. It's nothing but a gussied-up libc implementation for 8-bit AVRs. It's as "real time" as you want it to be.

Don't get that worked up my friend! It was meant as a compliment for the sly sleight, I do have a sense of humor... (oblique, but that depends on the crowd's judgement.)

I have some good news for you. There is a place where that type of humor is appreciated. That place is Reddit.

I recognize jokes are rare here, but that one was borderline at most. Reddit is where that comment would birth a chain of Galaxy Quest references.

The GP's joke was good dry humour that, given the lack of downvotes, was clearly appreciated. Reddit is where you go for low-hanging fruit. So no, I'm going to push back against turbonerd NO FUN ALLOWED types when the jokes are actually funny.