Calling this a truth is pretty silly. There is a lot of evidence that human cognition is highly dependent on environment.
For example, there are a lot more boys than girls who struggle with basic reading comprehension. Sound familiar?
I don't like ignorance being promoted under the cloak of not causing offense. It causes more harm than good. If there's a societal problem, you can't tackle it without knowing the actual cause. Sometimes the issue isn't an actual problem caused an 'ism,' it's just biology, and it's a complete waste of resources trying to change it.