A generalisation is an idea or conclusion having general application. You cannot use generalisations to refer to all instances.

To clarify further, just so there's no confusion (something quite widespread today...) A sweeping generalisation applies a general statement too broadly. If you take a general rule, and apply it to a case to which, due to the specific features of the case, the rule does not apply, then you commit the sweeping generalisation fallacy.

This is what you do when you say all private schools are bad, without further inspection of the specific school in question.

This is not what I do when I use 'tourist-teacher' to refer to a person who teaches to fund an extended holiday, not because teaching is something they are passionate about. Nor is it what I do when I call a specific person lazy for saying they do the bare minimum for their classes.

I do hope that clears matters up for you. Please feel free to continue changing the meanings of words, and the entire content of my posts, to fit your own lunacy again. It's getting quite funny now!