It's from Hip Hop / Rap culture originally, I think.

From the Urban dictionary: Basic bitch is a term used to condescendingly refer to women who have predictable or unoriginal style, interests, or behavior. The term has been criticized as misogynistic, though it has been reclaimed, to some extent, by women who have been labeled basic bitches.

So it is meant to be derogatory but it's not because about one thing or another we're all basic bitches. Doesn't matter who you are. Things become common for a reason.

It's a reclaimed misogynistic term now on this side of the pond.

Yeah. Rapper Lil Duval had a song called Basic Bitch about a decade or so back.