Language
I visited just the other week there. I had read that Català was spoken on the island and so learned a few phrases and whenever I was interacting with people, I learned what I wanted to say beforehand, in Català.
However, I found that people mostly spoke in Castilian. Even when I used bon dia and adéu, the reply was usually "adiós".
One woman working in Repsol actually corrected me when I said "numero set, si us plau", and she said "siete", a little curtly.
I'm very confused now. Did I spend the week there pissing people off, or what?