School Put-downs tegatively affect learning

It's perhpas no surprise: after all, it is a regular part of courses for teachers about learning and classroom behaviour issues. However, the study is further confirmation that inclusive classrooms and schools are more likely to be helping learning and improving their results. Report here: High School Put-downs Make It Hard For Students To Learn, Study Says Summary statement from the article: "classroom disruptions and psychologically hostile school environments can contribute to a climate in which good students have difficulty learning and students who are behind have trouble catching up."
Of course, it's worth considering the wider significance: if this, as seems likely, applies to workplaces and other human groups (including, say, Alpha groups or church councils) ...