You should know better than to behave like that.

你应当明白事理，不该那么不懂规矩。

《牛津词典》

You should know better than to be out wandering around.

你该知道在外面闲逛是不好的。

youdao

You should know better than to play football in the street.

你应该知道的，不能在大街上踢足球。

youdao

McAfee, you should know better than to use this underhanded method of distributing your software.

FORBES: Adobe! Cut This Nonsense Out!

Then you of all people should know better than most -depending on the isotope and type of radiation involved, radiation once released can persist for anywhere from hours, to thousands of years.

FORBES: Like We've Been Saying -- Radiation Is Not A Big Deal

If you took offence and are unhappy, I am sorry, but you as a professional should know that the article we used written by you was in very bad need of editing, and is much better now than was originally.

FORBES: Cooking Magazine Gets Poached Egg on the Face