Watching the tunnel cam raises some serious questions about how officials (and the FA) should be dealing with the abuse they recieve from players and managers during match days.
How/why the referee let him mouth off like it is baffling.... book him or send him off.... it's the only way to curb this kind of disrespect towards match officials.
Hate to say it, but if it was Rugby Union, then the manager wouldn't have been allowed to return to pitchside after halftime.
Utterly disgraceful behaviour.