EDIT: Just realised this was an insta blocking thread and not a general one! But I'll leave it below anyway
WWE wrestler Randy Orton - He was tweeting about something political about BLM back in 2016 and I replied something along the lines of "big man Randy Orton supporting racists". Anyway blocked. No loss, I watched him when I was like 10 and have seen enough of his online personality to know he is a big bully and quite clearly, a big republican.
Chrissy Teigan - Again, around the time in 2016. I didn't reply to her or anything. Just said "Chrissy Teigan really does think the world revolves around her" and I found out I was blocked maybe a year or so later lol. Clearly searches her name!
Probably a few more as I was quite gobby on twitter back then and my tweets would blow up but i never realised until way after