回复：老资历的组员在组会上对我发飙，应该敲打到多重？

Listen, you handled well so far.
my advice, don't expect to turn everything around in a single battle. You already scored some points. For now, shake hands with the branch manager, keep a positive manner and attitude, do you what you think is a right.
No matter what, keep calm, keep professional, speak slowly and speak to the point.