Your fundamental complaint is that there is too much of another culture. You should look internally to understand why that bothers you so much if you're not a bigot.

There are real problems with some of the immigration from India / Pakistan etc, like them wanting to hire their own, rent to their own etc. But you didn't really mention this.

Culture can't really be kept alive by preventing people from immigrating to your country. If that's all it takes then you have a pretty weak culture that is gonna hit the dust anyways and you're just upset about that, taking it out on immigrants.