proverb/vɑ̃tʁ a.fa.me n‿a pwɛ̃ d‿ɔ.ʁɛj/
words are wasted on a starving man; a hungry man is an angry man (you can't reason with someone who is hungry)
Literally, “a hungry belly has no ears”. From the fable Le Milan et le Rossignol by Jean de La Fontaine.