Meanings of gross generalisation in inglés

It's a gross generalisation to say this current generation is too entitled, but it might also be true.

This is a gross generalisation because, as befits a great movement, Fianna Fáil has a broad spectrum of opinion on the bird issue.

That sounds like a gross generalisation but it is a recurring theme in reader comments below articles on British TV published on US websites.

We simply hope that the opinions are well-formed, evidence-based, and do not spread hatred due to gross generalisations and misinformation.

What we do not need are gross generalisations about the past, simple-minded models pertaining to the present, and outmoded appeals to a "post-colonial" mentality.