现代英语经常把upbringing 看做可数名词，特别是当它的前面有修饰词的情况下，指一个人的教养。剑桥字典的解释是noun [ C usually singular ]  例句：The children had had a harsh upbringing.

牛津字典的例句是：She had had a Christian upbringing. 美国报刊例句：The absence of a religious upbringing unfailingly manifests itself in a person's character. 

网友的问题句可能是漏印了a 。 因为这种情况下用a 是常见的，he's had a good upbringing，不用a 罕见。