I disagree that a Theravada Buddhist is an orthodox Buddhist.
Firstly, all Buddhist traditions think of themselves as orthodox. What makes Theravada anymore orthodox than Chinese Buddhism or Tibetan?
Secondly, few Theravada monks even read scriptures let alone follow the teachings.
On the Acharn Chah group, I recall seeing the young monks washing the feet of the 'senior' monk when coming back from bindabart. Feet are conisdered particularly dirty in Thailand and it is a great insult to let your foot touch anyone else. The senior monks see this as a good way to teach detachment (and to get their feet cleaned without dirtying their hands). Others just see it as exploitation of the weak.