Помогите, хотя бы пару аргументов, такая тема: Older generation insists on that

Помогите, хотя бы пару доводов, такая тема:
Older generation insists on that people should speak clear and correct English/Russian or any other language. While younger generation uses a lot of slang in their speech and thinks that they are making the language more colourful this way.
заблаговременно благодарю)