I have a project that is a follow-up work of a senior PhD student, and my student is working on it. Due to their experience of the previous project and expertise, it is led by my collaborator, not me. My student is junior and sometimes makes mistakes, such as careless typos, or ignoring my collaborator's comments. My collaborator may have higher requirements and standards, so they directly pointed out those mistakes, and asked in person why the comments were ignored. In the meeting, my student was complaining directly that their collaborator doesn't like them and is targeting them, and that the collaborator keeps on saying that their work is wrong, things like that.
To respect my collaborator's leading role, I do not get involved unless I am asked. In my role, what should I do? For sure they won't collaborate anymore beyond this project, but I am not sure how to handle the current one. And also, should I educate my student about etiquette and respect? I have a feeling it already went beyond academic or scientific debate. My collaborator may not like my student either (I am not sure), but to my judgment all points my collaborator made are reasonable.