My experience has been that the UMers are engaging in self-fulfilling prophecy. They have “always expected” that regular scientists will reject their claims because they are closed-minded, and so when regular scientists do reject their claims, it must be due to their closed-mindedness! After all, the UMers “always expected” it, so it’s pretty much a scientific prediction that came true!
Again, please take a look at the forum discussion I linked. They can’t even take the most obvious criticisms in stride. They seem like nice people who simply aren’t very good at facing challenges to their beliefs.