Scott told Caroline that he and Luke S "repel each other".
"He's like someone at Camp America, he's so into himself," he said.
"100% confident of what he thinks and him being correct, it's irritating when someone talks over me and bypasses me and dismisses me. It's subconscious, not on purpose."
The housemates have been nominating again today, ahead of the eighth eviction on Friday.
Big Brother continues daily on Channel 5.
Big Brother Day 48 - Photo gallery:
Copyright: Channel 5