in my opinion, to overcome the disruptive behavior in teaching learning process is the teacher should not warn the students loudly. the harder the students warn them, the students will ignore the teacher's caution. in addition, the teacher should announce about the rule of teaching learning process by their agreement. the teacher may ask them first about what they want in the class and the teacher also share about his willingness during teaching learning process. by that discussion, there will be a fair rule in the class, and each students and teacher in the class will obey the rule. That can be called as "student-centered". If the punishment will be given, the teacher should not give the hard punishment, but the teacher should give the educational punishment such as memorizing vocabularies, summarizing the lesson given, and so on.
unfortunately, the disruptive behavior happens not only because of the students themselves, but also because of the teacher himself. when the teacher cannot manage the class as well, it means that the teacher has big homework about it. in that case,. the teacher also should highly pay attention about his method to teach in the class so, the students enjoy the class and the teaching learning process run well.
references:
Jeremy Harmer. How to Teach English.1998. Addison Wesley Longman
H.Douglas Brown. Teaching Principles- An Interactive Approach to Language Pedagogy.