Sealioning is the constant bad faith, feigning ignorance, asking for evidence of everything under the guise of “just asking questions”. Then ignoring any evidence presented and moving on to the next demand. Used to shut down discourse entirely.
Tankies are leftists that defend or deny the atrocities committed by authoritarian communist regimes like the Soviet Union or the CCP. It was first used to describe communists in Great Britain that defended the Soviet Union for using tanks to crush anti-communist revolutions.