If everyone was jumping off a bridge because Darth Vader revealed he was Luke's father, would you do it too? Woops. Spoiler alert.
Seriously though, even though it's kind of unavoidable since every social media post is full of memes about it and every conventional media outlet openly runs spoilers about it in the title or on-air, it was still intended to be a surprise reveal in the show, so you should be considerate of that.
I was just fortunate enough to see it early on the first day and remain unspoiled, because that was the best surprise reveal ever.