"oh my kids don't speak Malay"

I do wonder why some parents are proud of the fact that their children are not able to speak their mother tongue well. My son's ability in his written assessment and communication to his grandparents in Malay is a long way to go in being near native, but I know he will get by. I know I can do more to get him to speak Malay "like water" as in fluently and I would be a shame for myself to know of a non-Malay who could even do higher mother tongue. But when I hear remarks by some other Malay parents who seem to gloat when they say, "oh my kids don't speak/understand Malay," it's like as if they are ashamed of their own language. I do wonder the pride they have in being monolingual. Wouldn't it be advantageous to be bilingual? And especially so if it's in your native tongue? So here's a little story of a mother mouse and her mice. I hope it will make those parents think before they say those words above.

A mother mouse was with her litter of mice when they bumped into a fearsome looking cat. Immediately the little mice hid behind her in terror. Mother mouse, with all her might, tried to look strong and stare straightly at the big terrifying cat. Though her heart was beating really fast and beads of perspiration was running down her hair, she stared at the Cat with piercing eyes and then she shouted in her loudest voice, "Woof, woof!" The cat, thinking there was a dog behind her ran away as fast as it could.

The little mice were so proud of their mother and her fast thinking as they think that they couldn't have done what their mother did. So this is what their mother said,"It's always good to know a second language."