I like the lesson about those students right out of High School, and that peer impact, more than academic impact, has a bigger role for them in motivation.
This makes it all the more important to praise publically and criticize privately, lest I shame them in front of their peers, and de-motivate them to come to class.
I would say this is what I try to do in all cases, and it makes sense, but the lesson really highlighted it for me regarding the teen student.