Both of the fandoms have fighted before when Grande made " Thank you next " 6 months after "sweetener"
Taylor has feued with loads of celebrities before and most of the time to end them she performs with them.
She never feued with Grande publicly but may of in DMS.
Swift could of killed grande for reaching 200million on Instagram.
Swift may of killed grande  as grande worn Album of the year instead of Taylor who made her album at the same time. People are also so quick to compare these two to eachother  which neither of them like and they despise it.