For background. My SIL is of one race (doesn't matter which, just not white), I am mixed race with one parent of same race as SIL.
SIL has a child who is energetic and runs around a lot, doesn't sit still.
MIL commented to me that the child has Adhd (never diagnosed, MIL is not qualified to make diagnoses), the reason being that the genes of SIL (not her daughter, but her son's wife) mixed with British genes have soiled the gene pool, hence crazy energetic kid.
Cue me being seriously offended as (a) it's racist and (b) I'm of same race (albeit mixed) and have recently given birth to a child.
MIL feels attacked as I kicked up a fuss with her and DH. DH thinks I'm overreacting and his mum is not racist.
AIBU - yea you're overreacting, MIL is of a different generation and doesn't understand these things (dh's words)
AINBU - what the fuck is wrong with MIL?
Aaahhh.