Are they suing for defamation? I may have misread, but I thought the suit was over the nature of the comments, more so than the target.
From the article
Maréchal faces a fine of €30,000 ($32,446) if she’s found guilty of using a transphobic insult and €3,750 ($4,056) if she’s guilty of using a “sexist insult due to one’s gender identity.”
To me, that sounds more like they’re suing over an ethical standards issue, but I don’t know French law in the least.
I guess maybe the group could be suing over the ethical issues & Gascon’s could be a defamation suit, I just didn’t see that laid out in the article.