、。
I can't stand that guy.
Literal
I [topic-は], that-guy [topic-には] endure-cannot.
あいつ ('that guy') is rough/derogatory — a casual third-person pronoun that signals the speaker's irritation or lack of respect toward the referent. 我慢する ('to endure, put up with') in the negative potential 我慢できない = 'cannot endure.' The には stacks に (target) + は (contrastive topic), marking 'as for putting up with that guy specifically...'