Blocking a Dribbble user ensures they will not be able to:
- follow you
- leave Feedback on your shots
- add you to Lists
- add your shots to Collections
You can block any user on Dribbble by selecting the user menu on their profile page and selecting “Block [user]”: 
You can also remove a block from any previously blocked user in the same way by selecting “Unblock [user]”:
If the user has violated Dribbble Community Guidelines, please Report them as well.