Of course the situation is ridiculous, nobody should be fired for some crass jokes they made a decade ago, but so far as i'm aware it was the radical left who instigated this ridiculous culture of trial by social media and now the right are using their own weapons against them.
As sorry as I feel for Gunn as an individual case, like far too many top-tier Hollywood types he comes across as incredibly opinionated and pompous on social media. Generally speaking these types should probably learn to tone it down a bit with the pontificating to us mere mortals and pushing their half-baked ideological agendas when they have skeletons in their own closets.