Question of mental age

Hi All,

My daughter has had a recent diagnosis of mild autism. She’s 10 years old in a mainstream school and is in most subjects at national and above level. 

Her main problems are interaction although she gets on great with certain kids!

she also struggles with anxiety, mainly things she doesn’t believe she can do which she ends up finding easy!

A friend of ours made a comment about what her mental age is the other day which caused great offence. 

Am I being over sensitive or was this out of order?

Thanks everyone. 

Paul