If you look a bit harder, you'll find racial slurs all over their timelines. They probably cued in on the word "fascist" and formed a little ol' trolling brigade. They are all shitposting 4chan refugees.
I'd recommend blocking them all, probably at the domain level. Ain't nothin' good coming out of there.
@BNFTSFTW Thank you for digging. I only looked a few toots deep on each. I reported each of them after I noticed the fourth letter come in. Not sure it will help.