It is probably a combination of the perpetrator being a trans woman as opposed to a cis dude, and of the circumstances being much more clear cut.Perhaps that's the thing I've been missing in all this: the near immediate and severe consequences. That is yet another unique facet to this incident. And it's good! But also suspicious? Like... would the consequences have been so severe and quickly handled with a Bill Webb-type? Because the contrast between the fallout to those two incidents are night and day.
That may be my own personal hangups. I want to believe that the outcome here is "we have gotten much better, as a hobby and industry, at swiftly and appropriately taking action in the face of such actions" and not "it's a heck of a lot easier to punish this trans woman than a more powerful white male."
The reports I could find on Webb and Mentzer are vague. As far as I can tell, Mentzer has been an a-hole online (and possibly in person), but I can't find any reports of him getting physical with anyone. I can't find anything on what Webb supposedly did other than follow the victim around, and getting a PaizoCon staff member injured when they tried to intercede.
Grant, on the other hand, got into bed with her victim, demanded "cuddles", and pinned her victim to the bed until Grant fell asleep. That's way worse than Mentzer, and likely worse than Webb (given that his deeds were more or less in public, I would be surprised if they got beyond "inappropriate touching"). I'm not trying to excuse Mentzer or Webb here, I'm just saying there are degrees of Bad, and Grant went far beyond what either of them, to the best of my knowledge, did.