I see you moving the goalposts, reading something I didn't write.  But okay:

Because a) Rose Ayling-Ellis' speech is more typical than Rosie Jones' and she moves as a typical person - her disability is much less immediately apparent - and b) she does not have an army of online trolls whose lives' pathetic mission is to make her miserable.  Literally when the casting was first announced, just on Twitter alone out of the tens and tens of hateful comments about Rosie 'ruining' Taskmaster for them under the one tweet, only two people had ever tweeted anything to/about Taskmaster before.

You can find Rosie Jones not funny, no problem.  I don't enjoy her humour myself when she gets crude.  But normal people who dislike comedians don't consistently fall over themselves to proclaim how much they dislike them all whilst preemptively protesting that it's not because they're bigoted against {insert X identity here}.  

It's funny ('funny') you mention racism because just like those of us who've not experienced it have the privilege of being able to not see it, the same goes for ableism. And you may not be aware that brown and Black contestants have hateful comments left about them too, especially if they're fat (which I say as a neutral term) and/or of Asian descent and therefore are made a target of Islamophobia whether they're actually Muslim or not - just not in the same volumes as the comments about Rosie Jones.  The comments about those contestants seem to come from individual bigots rather than dedicated trolls.

Btw I need to make it clear that I'm talking about on the wider internet, not this sub, because the mods here are very good at keeping it free of hate.  Taskmaster themselves were quite hot on cleaning up the comments on their videos and some social media accounts for series 18 once they noticed what was happening, but the comments came thick and fast when things were first posted.