Yes damaging, my mum did this - and she loved me loads, but still feel I'm not good enough
Have to bite my tongue sometimes to avoid labelling my dd (3.5) and seeing every little thing as major behaviour trait that must be commented on!
Not sure if there's anything you can do, except to say 'oh my dd/ds does xxx too, I think all kids do - or something'. The mother's probably been thru' it herself in childhood, but that's no excuse