... then gays should be allowed to discriminate against Christians.
Agree or Disagree?
Nope, since most Christian's are not bigots; those who are do not serve Jesus Christ, who they claim to deeply revere.
As to the most recent Supreme Court Decision, it seems the bigots and their supporters want to believe Christians have been given permission to discriminate against Gay and Lesbian's, which is not what the Supreme Court decided.
However, states have the right and duty (IMO) to protect everyone from discrimination in the public domain, and one must hope that at the very least the owners of Bakery's, and of all other business establishments licensed in the state, are required to post signs in a prominent place in their windows and in all of their advertisements, that that alert the customers to their policy:
"We reserve the right to deny service to anyone, and that includes Gay and Lesbian Couples who want us to be complicit in their Sin, and their attack on Marriage"
This will allow the couples to keep their dignity and not be embarrassed and hurt by a callous disregard for their feelings (and allow heterosexual men and women who believe in the Golden Rule the ability to boycott the establishment, as many of us have done to Hobby Lobby and Chic Fil A).