Sentence:  Such a difference of opinion is passed over with a shrug of the shoulder, for some “regulars” practise empirically (clinically), and others scientifically. The “majority” and “Medical Ethics” contend that every practitioner shall sail under the colors he or she may select, but not use one which may be <WSD>chameleonized</WSD> to suit the individual notions and prejudices of the public at large. 
Meaning of the word marked with <WSD> tags:  To cause to change colour or turn various colours; to transform (to suit changing circumstances).