It really depends on how they go about it. Straight up maliciousness from anonymous forums, with the intent of damaging the talents? Absolutely, they'll practically slaughter them.
If they go after people that are straight up lying about talents, but doing so in a joking manner, they'll have a bit more trouble as that's a grey area and should be considered case-by-case if it's actually worth going after.
If they try to go after people with negative opinions about talents based on their current or past public actions, well, best of luck to them - more costly legal battles, not to mention public perception will plummet, so surely that's not what they're going to do, right?