Bangalore is a cosmopolitan City with mixed population spread over the metropolis. The exclusiveness of community wise living has dissolved fully due to the influx of people from all states of India after the City has become a silicon center. However now there are groups of like minded people who have organised themselves religious groups, music sabhas etc in each locality. Chamrajpet where the main Sringeri Shankar Mutt and Sri Ramakrishna Mutt are located is one of the best localities for religious activities ( but mostly Kannada based), so also Fort, V V Puram and Basavangudi are famous for cultural activities. The old Tamil area , the Bangalore Cantonment has a Tamil Sangam, Odukathur Mutt, Ramakrishna Mutt and many Temples including the famous Someswara temple at Ulsoor.
I have been living in Bangalore for 46 years and I can assure you this is a wonderful place to live, the local population, particularly of Kannadigas and Telugu people are exceptionally friendly lot. Ofcourse it also depends on our interaction with others.
Regards,
Brahmanyan,
Bangalore.