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In Malayalam/Indian, there's an expression:
Appam thinnal pore, kuzhi ennano!
It literally translates to:
Just eat the appam (Indian pancake). Why count the holes!
It implies that one should just enjoy the final product and need not bother how it originated.
It is usually said by an impatient person when asked too many questions about his product or method.
What could be an equivalent expression in English?
I suggest this old saying by Tucker Max "How were you supposed to know he would stoop so low? After all, the devil.......
Tucker Max - an American author and public speaker.
The equivalent in English would be
If you lie down with dogs, you will get up with fleas
Prov. If you associate with bad people, you will acquire their faults
[The Free Dictionary]
Their usage example fits very well with your context.
Granddaughter: It's not fair. I'm starting to get a bad reputation just because I'm friends with Suzy and she has a bad reputation.
Grandmother: It's only natural. People think that if you lie down with dogs, you will get up with fleas.
Best Answer
Although it emphasizes gifting or offering perhaps more than the idiom about the holey pancake, 'not look a gift horse in the mouth' is very similar both in use and in intent:
[look a gift horse in the mouth. (n.d.) Cambridge Idioms Dictionary, 2nd ed.. (2006). Retrieved February 12 2016 from http://idioms.thefreedictionary.com/look+a+gift+horse+in+the+mouth Emphasis mine.]