Maybe you're overthinking it. People just don't like to hear about something that's completely irrelevant to the conversation. If you really care about improv

Maybe you're overthinking it. People just don't like to hear about something that's completely irrelevant to the conversation. If you really care about improving some one grammar, send a private message. It can be very useful for a non-native speaker, especially if it's not a total stranger to you. Saying out loud "fix your grammar" doesn't make you a hero on a white house.