Not exactly. They ruled that the People of California (or a subset thereof) cannot jump in and act when their elected leaders choose not to act. California did not rise to the defense of Prop 8 when it was ruled unconstitutional so a group of people chose to file an appeal. SCOTUS said they didn't have the right (standing) to do so. Their solution would be at the ballot box. In other words, SCOTUS reaffirmed that elections have consequences.
I see now what I must do in the next election. After I fill out my ballot instead of returning it to the polling place I must send it to the 9th Circuit federal court so they can correct any of my votes they deem are "wrong" before my votes are counted.
Correct and in politics only winning counts. Staying home, voting third party, etc. is simply acquiescing to the will of the majority of voters.