I don't have a problem with Liz having a story grappling with maybe having a gay son (and the Spencer family heir, no less). I have a problem with it being centered around stereotypical or often offscreen behaviors we don't always see, and I have a big problem with it sometimes being filtered through Franco as a moral voice and main player.
The kid is not terrible, he can do a little more. He doesn't need a coming out arc at that age but you can give him a bit of an inner life the same way Claire Labine did with kids, the way writers also did with Robin at his age, which is younger than the Labine tweens. You can get rid of Franco. You can stop talking about the scandal of it all that he bakes or likes pastels or whatever else. You can let him speak a little for himself. The Conners has handled this in a delicate way with a kid of a similar age - it's broader and has a bit of a license because it's a sitcom, but the character has his own personality and the show doesn't have a serial killer who barely knows him as a key POV character in the story.
If everyone is just sitting around talking about Aiden obviously being gay because he has an easy-bake oven, that is the wrong way to do this story. I don't care who the little boy is. Because he is not getting a voice, however limited.