You can't unless they were to use the client tag (which I don't think primal sets). Lots of people have primal nip05's and use the primal relay without actually using primal.
Discussion
OK, thanks! Then my only option to retaliate is to ban all notes incoming from primal.net
Can I do that in #Amethyst or nostr:nprofile1qqsts0n0s20fk0s087ydcd7zj20ajv2t90m680zr6f0x5gp6w0p8wkqpr4mhxue69uhkummnw3ezucnfw33k76twv4ezuum0vd5kzmp0gasgfv ?
Don't retaliate against me please, I used to be in your position and today the Primal Android app won't load anything for me at all despite me being a Primal "Legends" subscriber (which I had to subscribe to in order to get them to stop hiding all my notes from everyone)