

She’s talking about Tomiwa Owolade’s words on racism in Britain.
She gives three, and only three, examples of racism to illustrate her point:
In pre-civil rights America, Irish people, Jewish people and Travellers were not required to sit at the back of the bus. In apartheid South Africa, these groups were allowed to vote. And at the height of slavery, there were no white-seeming people manacled on the slave ships.
Pre-civil rights America, the American slave trade, and Apartheid South Africa are all explicitly not about racism in Britain.
Tomiwa Owolade’s points may have been more focused (and more valid), but her own commentary takes it in a wildly unhelpful direction. And it’s her commentary that’s being criticised, not Owolade’s.
It’s just old fashioned terminology. 4% was the strength of a standard bitter or lager, round about 5% a premium bitter or lager.
The UK doesn’t use the term “light beer”, so you can probably just think of it as being the equivalent to that distinction.
Obviously there are some wildly strong craft beers out there these days, but the lingo still is what it is.