I could never stomach the cruelty involved in the wounding of animals.
he cannot stomach oysters
I can't stomach your constant nagging
I can't stomach his bragging. = No soporto su fanfarronería.
to stomach: If you cannot stomach something, no puedes aceptarlo porque te disgusta o lo desapruebas. Tolerar; soportar. Soportar o tolerar (a alguien o algo) || Comer o digerir