Since I had no life for a while- I actually did follow this drama...
What happened is, people think Onision is a super jerk ephebophile (which is true- his ex and current were both 17 when their relationship started) and people were worried about his Wife, Taylor (Lainey) because of how this man is. Mr Repzion made a video about this addressing her parents and wrote to them on Facebook (not only he did) Onision is blaming him for the letter that his in- laws allegedly got. He didn't write it DSSCTM did.
That's the jist. There is soooooooo much drama, though. It really is NOT worth looking into. However if you decide to- there are PLENTY of tumblrs dedicated to hating him.
Whatever.