It all started in this thread on /r/minecraft, where large Minecraft YouTube channel GameChap is reprehended by a smaller YouTuber AntiProTheory.

/u/GameChap's heavily downvoted comment

/r/SubredditDrama thread

Note: /u/SimplySarc is another popular Minecraft YouTuber. /u/TheMogMiner, who has the special Mojang flair, is a Mojang employee who works on the development of Minecraft itself.

I don't think I can or need to write a summary of this thread, and there's a lot in here worth reading, including links to previous dramatic events involving GameChap, Mojang's customer support manager, and the Yogscast, who is possibly the most popular Minecraft channel.

GameChap later made a video about the drama condemning AntiProTheory (but not mentioning him by name). A good bit of drama in the comment section, but because GameChap removes any criticism of him everyone there is on his side. More drama in the discussion page for AntiProTheory's channel.

Not only that, but GameChap also posted the video to /r/minecraft. The description of the video once linked to this thread saying "Support GameChap on Reddit" but it has been edited. As expected the post was heavily downvoted but it also has a bunch of comments continuing the drama.