I wouldn't call myself an expert but I got you.

Geechee was/is definitely used as a slur especially back in the day. It was used as a way to denote what was seen as country backwater ignorant heavily accented (Geechee) Black folk

Context on how it used
https://twitter.com/SAME0LMISTAKE/status/1275451047247396866

The thing is folk used the name of our group and culture as the slur so that kinda makes shit muddy.

It kinda like using "Black" or "African" as a slur the issue is alotta folk only know of our name as a slur or saw our culture and language as that demeaning

The trip was it was/is used by other "well to do" Black folk see our existence as a blight on the Black race and a barrier to them achieving assimilation within the white infrastructure.

The use of the word mainly depend on context I don't trip on it being used since it our name

The issue comes when you use our name as a slur then them hands gotta come out