Is it rude to correct someone's grammar mistakes in a conversation?

United States
January 29, 2009 10:41am CST
Having worked for an international community, one of the things that are required of the employees is cultural sensitivity. Sometimes we might think it's okay to do this but it may not be acceptable in others' culture. The nature of our company's business is English teaching, thus we deal with students, teachers who are native speakers of English as well as non native speakers like me. In the country where I came from, people get sensitive when their English grammar gets corrected. I have observed this to be true from my colleagues and country mates. Is it rude to correct a person's grammar mistakes in a conversation? Should we just let it pass or make corrections in the spirit of helping?