This is absolutely true. Thomas penned a dissent to a Per Curiam decision (a really unusual event) this year that said essentially the same thing.
Quoting Thomas: "If a lower court treated another right so cavalierly, I have little doubt that this Court would intervene. But as evidenced by our continued inaction in this area, the Second Amendment is a disfavored right in this Court. Because I do not believe we should be in the business of choosing which constitutional rights are “really worth insisting upon,” Heller, supra, at 634, I would have granted certiorari in this case." (emph in original)