*deepest sigh* Look...maybe this was the height of humor in 1989. Maybe this was all a now-mid-thirties child would read. Maybe it helped spark someone's lifelong love of literature.
But holy balls, please do not buy this in the modern age. I mean, luckily it's out of print, so it's not under high demand. But just...do not.
It's obnoxious. It's boring. And, yes, it's a bit offensive. I know some people will be like "Stupid isn't a bad word!" to which I respond "okay, but why does pretty much every parent say it's not nice to call someone stupid? Why?"
I'm big on intellectual freedom and not banning books, but as far as this one goes, if it is returned to the library irreparable, don't bother spending the money on getting a replacement. It's not worth it on so many fronts.