No, that's not how Chaos works. The Orks are largely resistant because they have a strong communal psyker field which protects them, but also leaves them without free will. The Tyranids are resistant because they too don't have free will, only one emotion which is hunger, and they're immensely alien to the human-dominated warp so it isn't compatible with them. They just drown out Chaos with the hungry noise. The Necrons are immune as far as anyone knows, but don't get too complacent - AI are demonstrably
not immune to Chaos and may even be more vulnerable. The Men of Iron were corrupted in this way. Also, the Necrons are almost all automatons or insane.
Chaos "feeds off emotions" because of the horror of the War in Heaven and humanity's inheritance of that legacy, but ultimately Chaos can come in myriad forms and adaptations. Powerful manifestations of the warp can corrupt pretty much anything to the extent that the term "Daemon World" is literal. The planet
is a daemon.
There is no conclusive theory of the Warp because it doesn't follow physics and thus is allowed to contradict itself or exist in multiple ways at the same time, but I prefer the one laid out in the fic
The Culture Explores Warhammer 40k (warning, it's dead and unfinished if you want to read it, though a good read still). This treats the Warp as a system of varying and overlapping "patterns" which dictate the Warp's side of reality or lack thereof. Chaos in this model is like a prion disease, folding other patterns into it and to be like itself, trapping the Immaterium into knots of agony. This is why people corrupted by Chaos cannot be fixed no matter how much they want to rebel - the pattern of their soul has been fucked up by Chaos and turned towards it. At best, they can resist or destroy themselves before the pattern can correct them. This is also why the moment of "true corruption" is so inconsistent and why the Armor of Contempt works, when the Chaos prion goes beyond re-patterning your body with mutation to affect your consciousness instead and denying Chaos prions any mental wifi connection respectively.