Can the teacher help the situation if some members of a group do not show positive interpersonal and communication skills?

How much the teacher can help depends on how severe the issues are and how willing the students are to improve. Of course, the teacher can have rules and consequences for breaking the rules which are enforced consistently, which will benefit the group, but not necessarily the individuals with the lack of skills.

To help the individuals, the teacher could include activities and lessons about positive interpersonal and communication skills to the whole class, as well as look for "teachable moments" to help the individual students, use games that help to improve the skills, etc.