It can be done better or worse - some of the best advice I got for teaching ESL was that if someone uses incorrect grammar, to simply repeat the clause with correct grammar and a 'go on?' tone. Immediate, low-friction feedback is one of the best ways to learn, what makes people think you're a jerk is if you call attention to their mistakes.

Of course, that's much easier in conversation than written communication. A good reason to make small talk with your co-workers.