I feel like it's also partly because Rael simply insists on befriending Yunifer? it's not like people became cold to Rael just because Yunifer didn't really befriend with Rael.... Yunifer have stated that she's uncomfortable lots of times, but Rael keeps on insisting, and Rael also makes use of Yunifer's indifference when she fake her own injury. They're both adults; it would have been fine if they stay as acquintances. (Idk Rael/Yunifer interactions just feels like when a big artist always replies to that one follower but that one follower got mad/feels unfair that the artist won't be mutuals with them)