So much animation! Wow.
There is no LeMond exception rule in the sense that people have some kind of blind spot for LeMond. Watching him race back in the day, I assumed him to be on all the same dope everyone else was on, or at least that's what my father, aunt and uncle thought and it made sense to me. Giant thighs, big gears, looked like a guy using 'roids to me.
Turns out though that over the years, so many people came out and for no particular reason mentioned how LeMond was the one of the only clean riders they knew or competed against who was clean. From early coaches, to teammates, to competitors. Even Fignon who accused him of using "illegal" tri-bars to beat him in '89 and was a 'roid user never says a peep about LeMond using anything. Based on his performances and the testimony of those who know, his stance against dopers, and also the utter lack of a single piece of compelling evidence against him, I came to change my mind.
Nothing has ever been turned up on him, ever. LeMond has stood the test of time. The only people who accuse him, and there have been plenty on this thread, this board and on cycling boards in general, are people who are new to the sport and just assume that "he must have been". Which is fine, unless they want to stick their fingers in their ears and not listen when those who actually have a lot of information to share speak up. The LeMond exeption exists because he's exceptional. Not because people look at him differently for no reason. They look at him differently because he deserves it.
And yeah, it's been Armstrong fans who needed Greg to be dirty, and now you see the same from Froome fans. The problem is that there is no comparison of the two.