I think she means “must not be”, and I agree.
Jeannette Ng 吳志麗 (@jeannette_ng) Tweeted: A scroll through Hong Kong’s protest art will tell you that stories & junk pop culture can inspire plenty.
But they’re not manifestos.
We can’t be the substitute teacher who puts on an episode of X-Men instead of teaching about civil rights movements https://t.co/RxtAcC8csY https://twitter.com/jeannette_ng/status/1267119819251503104?s=20
Here, Read This 