In my area bread is only eaten buttered when its the cheese course, you know the one before the dessert!
And whilst many would eat the cheese without bread nobody would eat it with bread but without butter.
If they were offered butter to go with their bread during the main course they would look at you as if (once again) you are from another planet. Never have worked out what its all about.
In a restaurant you will be offered butter with the choice of cheeses from the trolley, if you ask for butter for your bread during the main course its alien life form time again.