Sorry about the length of this text, I just felt like I had to say these things.
If you watched his videos, he was always sarcastic whenever acting like it was a war. Also, he mentioned numerous times in his videos that he has nothing against T-Series, and that he has nothing against Indians. In fact, there are a lot of Indians who like Pewdiepie. The plastic fans didn't watch his videos and thought it was an actual battle.
Also, he ended the subscribe to Pewdiepie meme because it was getting out of hand, but the plastic fans kept on going on with the meme.
And all his viewers know he's joking. Traditional media use clickbait to make him seem bad, and once he proves that it was a joke, people who didn't even watch the video claim he was irresponsible as an excuse.