You cut off the essence of the issue and what they're trying to do.
"We're not asking to exclude other groups. We're saying when asking to represent our community, we do not want a group that our community would object to." Just like the ADL, which is undoubetedly involved behind the scenes: Intolerant, and claiming to speak for all Jews "our community"
It doesn't take a genius to know that Messianic Jews don't represent Jews as a whole. It is not intolerant to say that. It's a lot like.. the Nation of Islam representing Islam. There are very fundamental differences in doctrine..