USA Ptooey and the ADL would appear to be the source of her talking point. Probably read it on the Twitter while on the toilet.
https://www.usatoday.com/story/opinion/2017/08/18/president-trump-wants-facts-right-wing-extremism-here-they-are-erroll-southers-column/577308001/
There’s absolutely nothing wrong with reading while on the toilet.