If you're really making a fuss about six bucks worth of coal, then yeah, you're a dick in my book. Especially at public fire pits. Seriously, it's six bloody francs. It's not the world.
Let me ask you a general question: Do you think of the people at the firepits as your opponents? Have you ever tried to see them as someone just like you? And I know this sounds rather offensive as you claim firepits and feel good about it (which, really, you shouldn't), but I am trying to wrap my head around your mindset. If you've never been to a firepit, then I can see how you'd think that people would like to snatch your spot, spit on your meat and generally make you miserable. But if you've been once, you will notice that the Swiss are quite friendly about all this.
And if you're so hellbent on just wolfing down your meat, then why do you bother going to a public firepit? They're there for the community. Eating is part of that community, yes. But, as I said, it's nowhere near a hit-and-run ordeal. If you want that, get your own bloody grill and eat at home. Because that way, you're not pissing anyone off and you're not pissed off by others' demand for food.
Small minds and all that, you know...
As I said, public barbecues are not about your party alone, it's about everyone. In all my years of doing this - the most recent one was last night down at the lake - I have not once had an issue with not getting my food or someone else claiming the fire for themselves or even going "Listen, we are really hungry. Can you just wait?"
The thing about the Swiss way of life is that people try to find a way to co-exist. Sure, this might be strange at first, especially if you're not used to all the things this entails, but it's quite a nice feeling actually. You go to the firepit, someone's got a fire going, you just join in and somehow, everyone gets their food.
Now, as for why I said the things about the iPods and the phones. It's not considered impolite to bring these things. But going to the firepit is a great way to just get away from everyday life. If you can play, bring a guitar. That's usually fun. This is less a rule, but more a bit of advice. It's immensely liberating and an amazing lot of fun if you're just you and the people who also happen to be there. The world will turn on its own and you're there, enjoying an afternoon at the water, grilling all the things. And when you get home, your iPod's waiting for you, all charged up, and your phone lets you know immediately what you've missed.
tl;dr: You have no idea what you're talking about and you are quite possibly someone nobody wants at a firepit. And for that, I feel kind of sorry.