Always call out shills.
Allowing them to go unchallenged demonstrates tacit acceptance.
That's all they need to let the board be seen as a bunch of retards, bigots and nazis.
The guy posting this advice apparently doesn't want any dissent aimed at shills.
Now don't go chit chatting with shills. Don't engage with them, just make it clear you strongly disagree with whatever shit they are spamming, then move on.