If they are going to insinuate things about what he said, they should mention exactly what he said or did.
The fact that they don't somehow tells me there is not much there to go on.
To put it another way, if they have the guts to remove Crockford that should have enough guts to clearly explain why.
I've been saying this before, and maybe it is just me, but it seems Node.js community somehow attracts a disproportionate number of immature people but with big egos. Because, let's call this for what it is -- childish immature behavior. That's at best, at worst it is getting attention and hurting someone's reputation just for a power trip. "Look how important I am, I kicked Crockford out of a conference with a single tweet".
Well the lesson is when you pick some open source technology, the community comes with it. Maybe even if technology has good merits, it makes sense not to pick it because the community behind it is not compatible with what you think a community should be.