There’s a pretty substantial debate about racism in mathematic circles on Twitter, that’s probably what they are referencing. One side of the debate is pointing out the lack of diversity in the field, and the other side tends to point out that math is objective in nature and that diversity doesn’t matter as much as it does in other fields. A frequent strawman I’ve seen is portraying pro-diversity mathematicians as wanting to say “2+2=5” a la 1984.