I’ve been using y’all in corporate America for about five years now and have yet had a manager condemn its use. It’s widely accepted now and I’ve had coworkers mentioned it makes them fondly remember family from the south. It’s just a good colloquial for referring to a group. Oddly enough “you guys” has slowly been entering my diction too due to working with more folks from the west and midwest.Midwest.

Ain’t is one I still unconsciously avoid in professional settings though.