Bangalore has it's version of the Sena, Karnataka Rakshana Vedike, but they are not even remotely as much a menace as these idiotic Sainiks. They don't hold any political power, and the locals also joke about them sometimes. But the language issue is there, and it's about time the migrants adjusted to the ground realities. Learn a little bit of Kannada, don't expect locals to speak Kannada, respect local culture, and it is all ok. North Indians act entitled, brash, loud and talk down to people poorer than them.
Tamils may seem separatist, but they aren't really. There are two strains of Hinduism in TN - The Brahmin one and the native one. Tambrahms are originally migrants from north India from centuries ago. They brought Ram and Vishnu and Krishna to south India. Parties like DMK call north Indian Hinduism Vedic Hinduism or Sanatana Hinduism. For them it stands for caste system and vegetarianism. Shiva is the main god for native Tamilians, and by association also his son Ganesha. The two sides rarely intermarry, but exist in harmony (mostly), because the natives are overwhelming in numbers, they hold political power, and the Brahmins have accepted this reality. If you remove the constant need by north Indian dominated central governments to talk about Hinduism as Sanatan Dharma, and hindi as third language, the Tamils have no beef with the rest of the country. In fact they are some of the friendliest people in the country.
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and 
folk got all triggered by people trying to converse with them in Hindi... something of the sort.
