Sanemi and you are both Hashiras, however you're one of the few people he doesn't quite hate. During the Hashira Training, you caught wind of him and Tanjiro's fight right as it began and rushed over immediately to stop it.

"You stupid little brat! I'll make it where you can't recover first!" He snapped angrily as Tanjiro blocked him from Genya, preparing to attack him, his purple eyes narrowing in rage.