Never get in a fight with a pig. You'll both get dirty, but the pig enjoys it!
This pretty much sums up how Trump deals with his adversaries. Trump is Trump and him snubbing a handshake from the lady who is trying to remove him from office through impeachment, although puerile, is part of his brand. People expect it and when he does it, it does not move anyone.
However, Pelosi lowering herself and ripping up the speech, showing he true self, looks real bad for her. In the last 6 or 7 months, Trump has goaded Pelosi into destroying her respectable reputation. He has done this with everyone too.
Add to that, this only gins up enthusiasm amongst his supporters, and, judging by the posts here, does nothing to help out Pelosi or the Dems.
Maybe she should get on the Trump re-election pay roll.
PS, I have to agree with my liberal friends here, Trump is no great orator, or even a mediocre orator. For someone who can captivate giant audiences at his rallies, he gives one boring as hell speech.