I'm with you there.
Our neighbours have got a little 2 stroke 70cc quad for their young daughter, and a larger 250cc off-road buggy for the 12 yo son. The 2 stroke clearly makes a fair bit of noise, but they don't ride it all day every day, it's just an hour or two each week.
Is it a problem to us? Hell no. Better they're amusing themselves like that than destroying the local bus shelters.
My 2 kids have got their own quads, 4 stroke 125ccs, which are really quiet. I asked my neighbour the other side to make sure it wasn't bothering them, and got the answer that they couldn't hear them, the only way they knew they were using them was that they would see the brake lights flashing on and off!

