I think its weird that we are considering second hand accounts from high school in the nth hour. Those are called rumors.
But hey, if this is the precedent we want to now accept
We have no idea what was contained in that letter and what corroborating evidence they may or may not have provided so it is impossible to call them rumors.
Again, it's just weird to me that people would try and make such definitive judgments over something when they have literally no idea what's in it. Like absolutely, positively no idea.
EDIT: And to repeat, I'm not aware of Feinstein pulling games in the past. If Devin Nunes suddenly found a letter that he said contained explosive allegations I totally understand why someone would dismiss it out of hand because he's a known bullshitter.