"Some Protestants" also claim Catholics aren't Christians.
That is done in an insulting manner. Not related to this topic.
I'm not interested in what "some Baptists" say.
Unless you are a Baptist you really don't get an opinion on this.
The link I provided (Encyclopedia Britannica) is also far superior in credibility than the link given here (wicked local.com)
I was merely noting what PmP was apparently incapable of explaining. There is a belief in some parts of the Baptist church (not just PMP) that Baptists are not truly "Protestants" because of how they split and when they split.
Why is it necessary to tell Baptists what they believe?
Sometimes that is how one learns.