I'm not saying anything particularly controversial here. Even Gordon Brown - our last Labour Prime Minister - recognised as such and was seeking to create some kind of coalescing new national identity. When even the left recognise it as a problem, you know something's up.

By dog whistle, you are suggesting what? By "shared national culture" he's talking about something racist?

Isn't that exactly the "national culture is hateful and outdated" notion he's talking about?

Yes, characterizing any anti-racist efforts as being "told for decades that said national culture is hateful" and "must be destroyed without any decent replacement" is a dogwhistle.

This sort of cherry picking and sliding definition of terms while pretending to be "just asking some questions", however, is known as sealioning: https://www.wikiwand.com/en/Sealioning

> characterizing any anti-racist efforts as..

I know what a dog-whistle is, I'm asking why you think you know OP is referring to "anti-racist efforts".

> This sort of cherry picking..

What are you referring to as "this"? my comments? I don't see the words you quoted (""just asking some questions").