I wonder if McD has a corporate policy.
Regardless, as much as open carry is a right, so is
a private property owner entitles to control what
happens on his private property.
Prosser is a stop on I-90 heading toward Spokane/Idaho
and points east and is a pretty busy place.
I do think that when a private property owner/manager requests an individual to leave, the person should exit immediately with no back talk, threatening, proselytizing or handing out brochures. I don't know what really happened. I might try to get to a hearing/trial if one is in the cards.