So, if one undertakes a cursory glance of Ramayan, this episode clearly emerges as a latter day adulteration which may have fuelled many debates, groupism, anti-Hindu mindset, anti-woman mindset, conversions and insults thrown upon character of Ram. However, the fact remains that the very basis for all this is dubious.
To sum up:
Following verses are clear adulterations:
Chapter 114: Verse 28 onwards, except last verse
Chapter 115: Verse 15 onwards
Chapters 116 and 117
Chapter 118: Except last verse