Swearing infront of kids.

Umm so yesterday we saw zehra & sujit swear infront of those little kids.
Whenever i m with little kids & say the word "stupid"...they all go like woooo u said the "S" word😆 But zehra & sujit used worse words & the kids didn't seem to react. Do you think this has become very common & how is it going to affect the kids?