When we refer to a barring in blackjack we are referring to the casino barring you (or preventing you) from playing simply because you are using your brain. Casino actions such as flat betting, shuffling up and lowering the betting limit also negatively affect a card counter. Yes, you can get barred for other reasons too!
On this day in 2014, notorious gambler Ben Affleck was barred from play for card counting at the Hard Rock Casino in Las Vegas. 😯
On this day somewhere, a blackjack player is being barred from further play. Reason: for simply using his or her brain while playing.
On this day somewhere, a card counter is being challenged and instructed by pit personnel: "No more blackjack for you. You can play any other game, but no more blackjack."
On this day somewhere, a pit boss will be flat-betting a suspected card counter. Flat-betting nullifies the advantage a card counter might have by forcing him to bet the same amount on every hand.