Why have some historians rejected the labels bc and ad as labels for periods in world history?

Because they are not culturally inclusive. They are based solely on Christianity:

BC = Before Christ

AD = Anno domini ( Latin for in the year of the Lord)

Now, it is referred to as BCE.

some people are just against it im not sure but i think everyone deserves to be treated equally i think people have a problem with it because its different and not like everything else i hope this !

< < < emily> > >

answer: both considered peasants valued members of society.

explanation: the ancient chinese and indian empires were large asian empires that had the same problems with other big empires, they had to work hard and sometimes fight in order to keep them united, they both relied heavily on their capacity to trade and to send strange and rare items to europe, and had the father as the head of the house hold in both societies, but they didn´t considered pleasants as valued members of their society, they were the bottom of the social pyramid in both of their societies.