Reply To: Denying Chazal = Apikorus?

HaLeiVi, beninguman, Sam2, yitayningwut, Avi K, et al,

If someone publicly said Chazal were misognist and wrong about instituting a bracha and therefore he would no longer say that brocha, and someone else told some other people that the first person is an apikorus for making that public statement and dropping the bracha, did the second person commit an aveira by telling people the first person is an apikorus?