Nobody uses the word tankie there. Tankie means something specific, a sympathizer for communist or aesthetically communist states which lack either free and fair elections, a freedom to criticize the government, or just general human rights.
Nobody calls people a tankie when talking about domestic politics. People either know what it means and use it correctly, don't know what it means but identify themselves as a tankie, or they don't know what it means and basically have nothing to do with the word.