Several things that Brian could do to improve them are:
- Learning another language and practicing it regularly with native speakers
- Interacting on social media with people he can share easily with because they share a common background and language
-Attending cultural events, such as with musical groups and guest speakers from other countries
Doing all the things above will make Brian became more capable in relating with other cultures. This will give him the ability to see/approach a certain issues with different cultural perspective beside his own,