It's a great idea to have that as an optional setting. But as far as I know, it doesn't exist as yet.
Hide opponent's rating

Is it possible to hide opponent's rating while playing against them?
Put a piece of duct tape on your monitor screen. You can fix ANYTHING with enough duct tape.

Put a piece of duct tape on your monitor screen. You can fix ANYTHING with enough duct tape.
LOL

This subject has come up several times over the past few years. Apparently it is too difficult for the programmers to do?

blueemu's suggestion is actually the best you can do. Alternatively, you could take an Expo marker and use it on the spot where the opponent's rating is. At least there, it is undoable if you want to go to another site without permanently damaging your computer/mobile device.
Is it possible to hide opponent's rating while playing against them?
I've noticed I tend to play better if I don't look at opponent's rating, but it happens very rarely that i don't check their rating next to their name until after the game is already over.