Agreed. I've seen some of this guy's stuff before. I would probably agree with some of what he says, but not his way of going about it. Furthermore, if I remember correctly, he strongly advocates KJV-Onlyism. I might just say to him, "Physician, heal thyself."
As far as comparing Catholic and Orthodox holy Orders (monasticism) to conservative Anabaptism, I would simply say that the rise of such Orders came from an unbiblical asceticism which was partly a Roman/Greek cultural tendency and partly a response (conditioned by said cultural tendencies) to other unbiblical trends in the church such as the inclusion of large parts of society in the church without a demand for true repentance and New Testament church discipline. We can sympathize with them but we cannot agree with them. ALL Christians are called to follow Christ but we are not called to separate ourselves into various groups with ascetic rules such as forbidding marriage or forbidding eating certain kinds of meat at various times, or only wearing certain types of clothing dictated by the order, or actually being separated in physical living locations and conditions from society in general, nor is any group of Christians called to be more holy than other Christians in general. All of those things are against the New Testament. Therefore, since they are unbiblical, they should not be used as justifications for anything Anabaptists are doing.