ども、愚弟がお世話になってるようで。の英語

Thanks, I hear you've been taking care of my little brat of a brother.

It is a cock-and-bull story.

It is an old wives' tale.

They are old women's tales―old wives' fables.

What folly!

A fool's bolt is soon shot.

It is a foolish person who never says a wise thing

A fool may say a wise thing.

Your imbecility disgusts me.

Do not say such foolish things.

Don't say such foolish things.

Stop grumbling.

It is the height of folly to do such a thing.

Sorry, I complained a lot.

It would be ill-advised to take such a step.

the poor fool

Your views are absurd.

It is the height of folly―folly itself―to do such a thing.

He thought how foolish he had been.

a bloody fool

the state of being both mediocre and stupid

How foolish!

Though he may be a dunce, he must be aware of that.

You have been good enough to listen to my long story.

of a person, the characteristic of pigheadedness

What I stupid thing I did.

It is way too stupid.

I hate people who complain.

Your views are absurd.

You have been good enough to listen to my long story.