Do not antagonise trolls under any circumstances. It may worsen the situation.
If we pay attention to them, make comments, and talk about them amongst ourselves, then we are recognizing their existence and impact, which makes them come back for more. Even if they won't admit it, there is nothing they can do that will seriously disrupt the community. There is no need to pay attention to trolls, especially given that it only encourages them to make more attempts at disruption.