@Linkat,
I don't wish to be fawned over, I just don't want to wait very long for a refill and I like a smiling, pleasant tender who will exchange a few words with a patron. Such attention should be the norm, but sadly it is not. If a tender is so inclined author without a tip, God Bless 'Em but they still deserve an expression of my appreciation. After all, we're not talking about huge sums.
I have had servers on distant shores tell me a tip wasn't required, and I'm fine with that and appreciative. I'll tell them I valued their service and they seem to appreciate it. I've never experienced a server indicating he or she was insulted by a tip, but I think that's because I don't tip with arrogance. It isn't difficult for someone in another country to figure out that I'm not a native. If they are going to be insulted by a well meaning tip from a Yank, then the hell with them.
I can't imagine a reason why I should abandon an American custom that is essentially generous.