What should I say to encourage my friend I’m quitting the McDojo Karate I’ve been in for 8 years (ofc black belt it’s a McDojo

Yesterday I just joined a Wing Chun school (Wong Shun-Leung) lineage and it's actually pretty legit, I like it (made everyone sweat like crazy), but my friend wants me to stay in the mCdOjO Karate I go to, I told him I can't but he just wants me to stay and not go to the legit Wing Chun dojo, what should I tell him so I can just train in peace?