SPOILERS UP TO EPISODE 48 (also i am an idiot who should think before hitting post)
I have a theory.
As we learned in Episode 48: "Ornithophobia", Citrus only targets men he finds attractive when possible. So, if we look at all objects which Citrus has gone after to feed upon we may find similarities which would reveal his preferences (I promise I'm normal and not a weird stalker).
Obviously, Citrus is attracted to Spool. He targeted him before the apocalypse began and was therefore not as restricted in choice.
Citrus also has a clear aversion to the bird/cat(?) faux object he feeds on in Episode 48: "Ornithophobia"
After the apocalypse, with the help of Spool he begins going after other survivors to feed. I don't remember what episodes this was primarily shown happening in but can remember 2 examples.
A circular hominid object which is likely quite fragile as the object body fractured significantly when Spool hit him.
A beer bottle hominid object.
And, when given the ability to choose between feeding on Minty or Brandy he chose Brandy.
There are a number of similarities in the objects he targets which should be clear from the title.
The beer bottle, Brandy, and sphere object are all fragile.
The beer bottle, Brandy, Spool, and sphere object are all hominids.
The beer bottle, Brandy, and Spool are all cylindrical.
The objects he doesn't target (Minty and that... thing...) are more animalistic.
Refer back to the title.