No need to be insulted - the average person is not an expert on down syndrome and the genomic/biological differences resulting therefrom. For example:
"Atlantoaxial Instability (AAI): Many individuals with Down syndrome have increased ligamentous laxity (looseness), which can lead to AAI—an excessive movement of the top two vertebrae in the neck. High-impact or collision activities that strain the neck (like wrestling, tackle football, or heavy contact sports) can raise the risk of spinal cord injury."
That said:
"Adapted and Monitored Activities: Sports like swimming, basketball, track, skiing, judo, and modified fitness training (including supervised non-contact boxing programs like Down to Box that focus on balance and coordination) are often encouraged as safe ways to build strength and confidence."
So perhaps, rather find such comments insulting, see them as an opportunity to educate the populace at large. I'm certainly learning as a result of this thread.