Document Everything: From the office network to software. You do not know if you are going to be the next person to implement a change, so the least you can do is leave a document for the next person to help them out.
Of course we can apply the same advice in sowftware! Leaving comments beside a block of code that was written in a hurry will help your future self during refactoring or, again, the next person that will maintain this code.
For further actions, you may consider blocking this person and/or reporting abuse
We're a place where coders share, stay up-to-date and grow their careers.
Another tip I might add:
Document Everything: From the office network to software. You do not know if you are going to be the next person to implement a change, so the least you can do is leave a document for the next person to help them out.
Of course we can apply the same advice in sowftware! Leaving comments beside a block of code that was written in a hurry will help your future self during refactoring or, again, the next person that will maintain this code.