You sweeping statements are on your favourite topics of teachers that you call "lazy" and "tourists" and similar stuff. You are NOT specific!

Calling somebody lazy if they say they do the bare minimum possible for their class planning is not a generalisation, it's a specific assessment of a specific statement.

You're having trouble with the definition of generalisation I see... So here it is in plain English for you: A generalisation is an idea or conclusion having general application. You cannot use generalisations to refer to all instances.