The LCMS does not condemn those who do not share our view of communion. We just ask those who do not believe in the Real Presence as we do to refrain from communing at our altar, as I do when visiting a church where I do not share their beliefs about communion. Otherwise they are welcome in our services.
When I say condemn, I mean you are not in communion with anyone not LCMS. I’m aware that other Christians are welcome in your churches—just not welcome at the Lord’s table.
In that sense, you follow Martin Luther who broke communion with Zwingli, because they did not agree on the meaning of the Lord’s Supper.