It could also just be that Traviss is an idiot and it just seems disingenuous coming from her. My anger isn't towards putting gay people in Star Wars or the Mandalorians, I guess, so much as I don't like her so it rubs me the wrong way that she did it. =P
She did handle it well, though, it wasn't like a "HEY LOOK I PUT THE GAYS IN STAR WARS EVERYONE!" moment. She just put in two guys who were married and that was it, everyone in the book accepted it as fine. It was only when she was asked about it that she outright said they were gay. So I was glad she didn't make a huge deal about it at least.