What should be done when a user is being abusive in the inbox?
Block the user.
As these are inbox messages due to privacy we don't have access to this & we can't verify this, so we request you to block the user. To block a user please follow the below-mentioned steps;
Go to the user profile.
Click on the 3 dots present at the top right corner of the screen.
Click on "Block User" & it's done.