Boeing played the same game the Democrats play and that makes them mad.
Boeing promised this and that when the state gave them incentives to stay here but reniged on those promises when they hurt their bottom line.
Of course the Democrats go into their secondary method of coercion, threats, and intimidation when they don't get their way.
If Boeing was smart, they would transfer all operations and business out of Washington and go to a non-union state with lower costs for business.