Revoke chat permission for contact in Gmail?

gmail set auto-add contacts email chat pane on left of gmail webpage, , this. every , then, gets added don't want seeing when i'm online, maintain contact , don't want block. there way can remove authorization automatically granted user chat me , see when i'm online 1 of has invite other chat in gmail?

 

couldn't delete contact? you'd have every time e-mail them or chat them though.

 

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