One must say first that there is no standard behavior to this topic. Many Catalans are, more on schedule than German, other, have tick rather the Spanish watch. One also should distinguish, whether one makes a public or business appointment. Punctuality is usually expected at such appointments.

In addition, the globalization and the tourism seem strong to the habits of the Spaniards.

One does not find a delay of 15 to 30 minutes such in the private area. If a Catalan must wait for you, he uses this perhaps with a visit in a bar in which he has the possibility of keeping the meeting place in the eye.
Indignant reactions, would astonish most Catalans.