Obviously protestant denominations vary both in their theological views of communion, and whether communion is "open" or "closed". I know Baptist churches that not only have closed communion, but even members have to be in good standing to receive. I'm sure there are others as well.
But I know what he means.
That’s interesting. I know Baptists can refuse membership until you have a Baptist baptism, but I haven’t ever been to a Baptist church which refused communion to non-Baptists.
But obviously, I have not been to every church :-)