Using his genuine sickness against him and calling him "uNFIT" is totally unfair, in my eyes...
Having said that, I would not want anyone to pull the stool from under me... I think it is insulting and rude... On the other hand, keeping in mind, the relation and bond Tanisha and Armaan share... I would consider Armaan justified...
He would not do that with Sofia or Gauhar... It was Tanisha and as he said "in his own world" Tanisha represents him too... This means that Armaan feels that he has a right over Tanisha...
Yes it was insulting and he should have avoided doing that... but he has temper issues... SO WHAT... It happened