Chi just begrudgingly puts up with it like the rest of Christopher's eccentric behavior.
Being under the impression that his Vitriolic Best Bud Chi might have a crush on him, Christopher tends to punctuate any sort of statement of affection with the fact that he's not into men, lest Chi gets his hopes up. Played for Laughs in Baccano! with Christopher Shouldered.Kaorin from Azumanga Daioh says she's straight, though it's quite obviously a cover-up.In Angel Beats!, Hinata has to continually reinforce to Otanashi that he isn't like that, subverted later in the series.