My stories will often feature some sort of class divide quite prominently and often have plotlines that revolve around the conflicts caused by that divide. Even my RPs tend to have that as a common feature in their settings and my works that do not have this as the focus sometimes still find their way into touching upon it. Case in point, Stairway to Heaven is definitely not a story focused on class divide but because of the difference between Layla's upbringing compared to that of Eloy and Gwen, it has briefly been touched upon.
It's not exactly something I seek out to make a recurring theme across my stories though. Rather, it is something that I myself feel very strongly about and so its a theme that will just seep into my work whether I'm aiming for it to or not as those are stories that typically resonate with me as both a creator and an audience.
Not all of my works, but a few fair of them have characters having rough pasts and trying to move forward from that. Foul Play has that with Grimsley and Nanu, even though I didn't set out on that theme when I first started writing it.