What is most often used in the classroom to decrease behaviors that are being maintained by teacher attention?

Extinction.

Explanation:

Extinction is a technique used by Applied Behavioral Analysis (ABA) that corresponds to the interruption and elimination of the reinforcement of negative behavior whose central objective is to cause undesirable behaviors to be totally eliminated or not to occur again.

So there are criticisms about this discipline technique, as it is considered that the ideal is to present a substitution behavior in addition to just eliminating the negative behavior, since n extinction only positive behaviors are reinforced, and negatives ignored.