I don't think anyone supported Yash during the b'day epi, no one supported his behaviour in front of all, but some of us explained why he did what he did, and that he was not the only one at fault, it was Aarti's fault too. It was her plan which was wrong, her idea of wearing arpita's clothes without his permission was insensitive, and so naturally Yash got furious. However, none of us supported his outburst in front of all those people. All said and done, both Yash and Aarti were wrong in the b'day episode.
However, in this situation there is no question of supporting Yash! becoz Aarti is being wrongly accused. Yash should hv known that she could never do something like it. But the problem with yash is, he never thinks of such things in detail! If he allowed himself some time to cool down and think, he himself would have realized how silly this accusation is!