A lot of people don't particularly care for Mike Z because he has a history of boasting a pretty self-aggrandizing public persona. He still harbors a huge grudge at EVO over Skullgirls getting snubbed because they include unreleased games at time of lineup reveals, he wrote a blog post criticizing Yooka-Laylee's kickstarter for not being "transparent" about them getting additional funding (which it was), pointing to Skullgirls' Indiegogo campaign to how it should be done, and there's a few deleted tweets out there where he slid into mentions of people praising UNIST for having good tutorials to talk about how good Skullgirls is.
None of the above which are anything serious obviously because there's some arguable nugget of truth in instances like those (EVO including unreleased titles is an opinion a lot of people share for instance), and honestly, fuck Riot Games. They should be called out. But I don't blame some people for thinking of this as another moment where it comes across less like there was some public service being made and more like it being another instance of Mike Z talking about how cool he is.
Dude is talented though, no doubt. I'm still excited for Indivisible, and I don't think he'd ever have trouble finding work if somehow Lab Zero doesn't cut the mustard for him anymore.