Rema711 -“an orthodox teacher”
He’s Not Orthodox! He doesn’t keep Halacha.
“when an orthodox Jew heard what he did he tried balling him out,”
Not the way to give Mussar.
“but the conservative rabbi claimed he did nothing wrong,”
He’s right! He’s a Tinnuk Shenishba.
The prob you have is that you don’t know whose Really Frum & who isn’t!