Anti-Catholics are of two types:You may also find Lutherans copied in the replies but they don't exhibit the same kind of loony responses and I don't know why they don't point out to these guys when they attack the Real Presence. There are also Pentecostals who don't seem to realise that the OPC and PCA consider them heretics for talking in tongues and believing in modern miracles. The Pentecostals also reject Calvinist double predestination so we know the PCA/OPC cliche hate them. And woe betide any Arminian Baptist (Mr. Rogers or GRizzled Bear as a case in point) for debating double predestination with the Calvinists -- they scream at him and call him names and say he doesn't know anything or that he is a Catholic "tool" and then use the same insults and lies against him as they do against us. That's why most Protestants stay away from these threads because the PCA/OPC cliche either disgusts them with their vitriol, or if they object, THEY become the target of the PCA/OPC anti-Catholic cliche.
1. Members of the OPC and PCA. These are the shouters, fully filled with the hate of their master and hating Christians all. They may call themselves doctors or moms or whatever, but their words are filled with hate and not with doctrine or love. They will insult, post fake photographs, links to fake articles, whatever. They never post what they believe. And when they do not get Catholics to attack, they will attack Arminian (Baptists, Methodists, etc.) telling them they follow a Satanic gospel, or Lutherans, Anglicans who believe in the true presence calling it a heresy to believe that Christ is really present in the Eucharist. The noise they make belies the size of these groups (20,000 for the OCP and 300,000 for the PCA and dropping).
2. The singletons who form kirks of one. You can make these out by the cluelessness in which they post. Whether they say they were cool or are babel truths or evangelical MLKs, it's the same, tired repeated nonsense they spout. They post threads stating how they hate large churches and how reading any Bible besides the KJV is a heresy. They also don't know anything about the Catholic Church besides how much they hate it -- they have been known to say "The pope never washes anyones feet" and then when given pictures of Maundy Thursday, they move on to another fake attack.
There are a few more such as the useful idiots of those who support the main harpies, but I think that you have more than adequately described the bulk of anti Catholics.