I was replying to what you said. His hyperbole regarding unintelligent customers was the behavior that was called out as not nice, professional or intelligent.

His piss-poor use of hyphens (see what I did there?), however, isn't hyperbole. Hyperbole is a rhetorical device (and the greatest thing ever!), and unless he intended to evoke an emotional response in his readers by their incorrect and non-poetic application, it's just bad form; Being from the UK has bugger all to do with it.

It's strange that you educate us on what hyperbole and rhetorical devices are, yet can't recognise both those things in a sentence which begins "Are there people out there...?". The author is saying the direct opposite; that people aren't that stupid.