Fortnite Or PubG

Can someone tell me why this war still exists?
I see so much hate from PUBG players for fortnite and I don't know why.
Epic games just created a free game mode for their upcoming game.
Yes, it is true pubg was earlier. But pubg never owned battle royale genre. They just made it more popular. Fortnite just implemented new mechanics that are fun and give players the possibility to use their creativity.
There are tons of articles that explain why fortnite outgrow pubg and it's not because of it is a game for kids.
I played both games and fortnite is a lot better for me and tbh if pubg focus I would say that it is a great game. But if my pc can't get more than 80 FPS on medium quality and i can run epic quality in overwatch, tf2 and fortnite... sorry but this is caused by developers.