If your 6½yo kid was in a playground with 3 other similar aged kids who yours was trying to play with, and they were all talking about what they wanted to be when they were older... And one child kept interrupting your child with silly comments like "a poo head" or "some jam" and laughing at you and your child was standing there head down upset while the other child did that...
Would you expect the adult standing nearby to comment "oh come on now they're just being kids" when you went over, intervened and said "that's enough, they're being silly, we're leaving"