While the reported backstage beef between WWE Raw Women's Champion Alexa Bliss and Sasha Banks is built primarily on hearsay, there's more than enough evidence to suggest the two aren't particularly fond of each other.
'The Boss' bloodied Bliss' beak in not one, but two individual NXT bouts. A single incident could be written off as an accident but the fact that it happened more than once suggests a less innocent explanation.
They've been taking passive aggressive shots at one another in the media for years, and regularly refuse to even acknowledge each other. There are countless instances of 'The Boss' openly scoffing at her foe. The duo made an immediate beeline for each other during a pre-Survivor Series 2016 brawl. The list goes on.
We likely won't know the full extent of their bad blood until 10-15 years down the road, when one (or both) has retired from the sport and deals the dirt in a tell-all shoot interview. Regardless, each of the things listed above seem innocuous on their own, but look a lot more believable when taken as a whole.
For what it's worth, they don't follow each other on any form of social media either.