Define "a few"!

I guarantee that however many individuals you think you are basing your pre-judgement of the entire 1 billion plus people of the Indian sub-continent on, it does not constitute a valid sample by any measure of statistics.

I also guarantee that how ever big you think that the sample of individuals is, the reality is that it is far fewer. Maybe 1 in 10 of those 'bad' individuals are people you personally have had any dealings with at all. The rest will be repeated 'anecdotal evidence' you've heard from like-minded members of your acceptable group, that you've subconsciously added to your own "general experience".

And so it is! The real misdemeanors of a few individuals of the given target group, get repeatedly relayed around by the members of the targeters, and so become reinforced and multiplied through selective memories of the "general experience" of those predisposed to that pre-judgement.

And I'll add my gut-feel pre-judgement that for every individual from the subcontinent that has come to this place in the last 2, 5 or 8 years, asking 'the wrong type of question', there have been three times as many asking similarly wrong types of questions, that have less distinctive user names and exhibiting a less recognisable form of English. But through their lack of distinction, they pale in significance because they do not fit the criteria of the predisposition.

There is a considerable moral distinction between the caution born of personal experience, and prejudice born of collective reenforcement of predisposed positions. You'd do well to consider the pre-judgements others will arrive at regarding you on the basis of the predispositions you display here.