Miss Manners: Can I correct grammar if somebody is loud on the phone in public?

An English teacher expressed a strong urge to correct the grammar of individuals speaking loudly on phones in public spaces. The situation involved people dictating messages where the spoken words were problematic, and the individuals further complicated the communication by verbally announcing their punctuation. Miss Manners was consulted regarding the social propriety of correcting such grammar in public settings, highlighting the tension between linguistic accuracy and public etiquette during these loud dictation encounters.