and Steve Schirippa (Bobby Bacala) used to be entertainment director at the Riviera in vegas. he has tons of celebrity stories some positive, some not so much. He used to book Ellen back in the day and said it was all good. Then he ran into her at the Emmy's and went to say hi, like hey remember me, the guy from the Riviera, and he said she dismissed him like he was a piece of shit.

To your point, i don't think it was anything coordinated by the network, more that twitter will never pass up any excuse to feel justified in dogpiling on someone.