This is terrible advice. The old saying is true... "You catch more flies with honey."
Be polite, but stern. As soon as you "go ape sh**" you're done. They won't help any longer.
It's not terrible advice. There's only so many times you can sit there like a little mouse and be like "okay, okay" and listen to their ********. If you make it clear that you're no longer taking what they're giving you then eventually you will speak to someone who can be of actual assistance. You sit there and accept the same ******** to be spewed at you continuously, then what is your end result? The SAME ********. But hey, different strokes for different folks I guess.