God has restricted the priesthood since the beginning of time. The Aaronic priesthood was first made available only to the sons of Aaron, and then only to the lineage of one of his sons. As time went on it was expanded to include anyone from the tribe of Levi. During Old Testament times only 1/12 of the house of Israel could hold the priesthood, and then it was only men. Certain men were killed by God because they were upset that Moses had the priesthood and they didn't.
When Christ came he brought the Melchizedek priesthood and its blessings and responsibilities. The New Testament is not clear on what criteria qualified someone for this priesthood, but it does mark the distinction between the two.
When the Gospel was restored through Joseph Smith there were certain requirements that the Lord set on the priesthood. ONe was that blacks could not hold the priesthood (interestingly enough, Joseph Smith himself ordained black men to the priesthood - there are exceptions to every rule). In 1978 the Lord revealed that it was time to extend the privilege of the priesthood to all worthy men.
If you want to express offense then you'll have to start with getting offended at God and then you'll have to get in line behind all the women who would like the priesthood as well. Then you'll have to get over your self-righteous indignation and develop some faith.