Greetings @agu1211403 

This sounds like you are suggesting a feature for Canvas? If so, you can submit it here. 

If you are experiencing harassment in your course, I would encourage you to speak with your instructor or someone trusted at your school.

One thing to consider in your suggestion is that there are many aspects of an online course, like discussions, that if another student were muted it could take away from the learning experience the instructor has designed - so I'm not sure the answer is as simple as a blanket mute.