Oh no, it's not the worst, it's not even close to the worse, it's just the latest example that has made me fed up. It's not even really a rude chat, it's just one that seems somewhat apathetic and lazy. But my point isn't that this was such a horrible example, but rather it shows a pattern that people have come to expect very poor, if not apathetic, customer service and that is just awful.
People seriously need to speak up and demand better.
And yes, as you said, don't yell, scream, cuss and be an idiot..that never works. Simply state your issue, show a bit of backbone and don't be afraid to be aggressive without being unruly. And use some "please" and "thank you".
If you're just a total @sshole you will get nowhere. But you also can't be a sad sack who just takes whatever excuse they're giving you either. It's a fine line to walk and most people just choose to give up and just take it..