You have simply derived a conclusion based on a small sample and elevated it as a generalization for a much larger sample. Inductive reasoning is useful broadly speaking but leads to false narratives unless supported by deductive proof - large sample evidence that tests a hypothesis.
Your assertion may potentially be right for your sample, but completely wrong broadly speaking. You won't know unless you assess it statistically.
The approach appears to be bigotry motivated given your emotive rhetoric and not factual proof. That is ok, but lets call it what it is likely to be.
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