There are a lot of opinions here and not a shred of evidence.
Fact. The Police were called to an incident on a QF flight involving Will.i.am, he was dealt with by the police in the reported manner.
Fact.. Will.i.am has publicly named and posted a pic of a QF F/A to over 30 million followers and directly accused her of racist behaviour using those words and hashtag.
Everything else that is not documented evidence is an opinion.
Will.i am may have some sort of case against QF if he can corroborate his story.
The Qantas F/A has hard evidence that she has been publicly defamed (pending evidence) by Will.i.am to his 30M followers plus half the universe who are on the webs.
We never get the whole story, we can go in circles all day but you can’t go past the facts.