Really, I think the entire reason this came up in the Gallente Federation instead of anywhere else is simple: it doesn't anywhere else and it's a great piece of ammunition for racists outside the Federation.
Let's face it, most of the characters on the IGS are really looking for reasons to dislike each other; EVE is a pretty distopian game that definitely plays up the petty grievances people have with each other into full-blown wars. That's what draws people to the endgame. Minmatar get shit every time any single one of them is violent, Caldari get shit every single time one of them is authoritarian, and the Amarr get shit every single time their human rights record is brought into question. It's just fuel for the fire.
So that's why this one singular court case is probably big news, because it is a negative case that strikes at the heart of what is said to be great about Gallente society. One issue suddenly brought out the racist, anti-immigrant minority in Federation space and now, you're all racists. Nevermind that segregation is rife everywhere else, the Gallente claim to be a free society so every little bit of story that seems to disprove that is going to get a lot of play. It's understandable. If somebody kills people in self defense, but there's questions about whether they were overzealous and crossed into murder, that's not noteworthy. It's noteworthy if THE ENTIRE GALLENTE FEDERATION IS A LIE!
Constantin didn't take the bait, but that's exactly the kinds of things rulers play to people in other countries, showing them why life there is so great where they live compared to everywhere else. "The UK is free? Look at the BNP! Obviously, it's just as racist as Saudi Arabia!" So having Matari talking shit about the Gallente Federation is totally understandable and reasonable. It's supposed to feel frustrating, because pretty much everyone knows it's essentially a scam. The Federation is probably more free than anywhere else in the cluster. Even if it's not perfect, it's a damn sight better than their next-nearest competitors. But their characters might be buying into it because, frankly, they're racists brought up in a racist society. It's comforting to see the light of the Federation take a hit so that they can revel in the schadenfreude.
I wouldn't take it personally. Just like we Amarr are going to have people playing the slavery button every time anything remotely positive is said about their propensity for moral living, the Federation gets to deal with every single instance of racial and cultural dissonance as if it's emblematic of the Federation. Just ignore the static and go on.