That's terrible, no playwright should kick someone out over a minor disagreement as long as it doesn't boil over into physical altercations and cause safety issues, instead that disagreement should've been taken into account and addressed either by changing a line or adding in your suggestion elsewhere.
I mean, sure if that disagreement boils over into frequent physical altercations and actually causes safety issues, then yeah, the guy in charge has every right to kick that belligerent person out and even get the cops involved if absolutely necessary and that person straight-up refuses to leave on their own accord, as it's still a workplace at the end of the day, but otherwise, no.