to (gently) point out to someone I don't even know that his daughter's condition is spelled 'cerebral palsy' not 'Ceribol paulsey' as he consistently writes it?
As I say I don't know the guy, it's just a randomer online, and I really don't want to risk hurting him, but it seems wrong to just let him blunder on in misapprehension - it's going to be a huge part of his life forever more after all.
His daughter is already 3, if that makes a difference.
YABU - unnecessary, it would just come across really toxic!
YANBU - it would be a kindness to tactfully set him straight