Just to play devils advocate here for a moment (and probably really stir up the pot)
but...
No one seems to have touched on the reason why the party is suing?
Straight up, it appears very silly - I agree, but the words of Herbert Spencer ring in the back of my mind:
"There is a principle which is a bar against all information, which is proof against all arguments and which cannot fail to keep a man in everlasting ignorance - that principle is contempt prior to investigation."
Let's say hypothetically speaking, I create a very recognizable trademarked baseball bat, that I'm targeting to the American market. However, a political party called "Seal Clubbers Inc" that want to bring back legalized clubbing use my baseball bat in many of their advertising banners, to the point where many associate my distinct kind of baseball bat with Seal Clubbers Inc. I lose major sales because my market is actively against seal clubbing, and the party. Should I be permitted any sort of grievance?
And before someone nit-picks the impossibility of this hypothetical example to pieces, I've just thrown this together in 2 mins to try and explain a point where some may consider where it might be fair to file a grievance.
While my example is way out there, let's not lose focus that the point is to show the simple fact that no one has mentioned the other side of this story yet. We don't know why they are suing, or what damages they are claiming against. I can't help but wonder if it would be a little more prudent to find these things out first before condemning their actions, regardless of how crazy they initially seem?