Some are only daft, but ye're red-wud raving.
Somebody may come to kame your hair wi' a cutty stool.
"Spoken by mothers to stubborn daughters, intimating they will come under the hands of a stepmother, who, it is likely, will not deal too tenderly with them."—Kelly.
Some can stand the sword better than the pintstoup.
Some folk look up, and ithers look down.
And, we presume, the proverb would have the reader to understand they prosper or fail accordingly.
Some fork low, but ye fork ower the mow.
That is, some people do not do their work sufficiently, but you overdo it.
Some hae a hantel o' fauts, ye're only a ne'er-do-weel.