Where you have mostly brahmins and a handful of other castes pursuing it. (Max 5-8% of population)
In North India, "vegetarianism" is mass culture. There is pressure to conform for the whole society
Very different attitude
This is extremely common
Such taboos are fewer in the South. Less strongly adhered to
Linked to lactose intolerance
Vegetarianism is stronger in the North West, where lactose intolerance is relatively low
In the South and likely East, intolerance is high, barring likely a few castes of northern origin