But sneering hypebole aside, I think a lot of the difference has to do with the arcs of their careers. Roger burned brighter for a shorter period of time (2004-07), while Rafa reached those heights for shorter spells, but had a longer period of being at a high plateau. Meaning, Roger fans accepted his decline because he was so dominant early on and then because he dropped and wasn't winning many Slams after 2009....so 2012 was a welcome surprise, 2017-18 even more so. Rafa never had an extended high peak like Roger did in those early years, but also didn't have huge gaps between Slams, and has had stronger comebacks, so it makes sense that his fans would be more in denial about Father Time finally, inevitably, catching up.
But what I see missing, and the main factor of this "denial," is looking at simply chronology: that is, Rafa's age. And then couple that with his recent performance relative to the rest of his career. Something is (probably!) different. I'm not saying definitely so. If anything, I'm saying, "Get ready, folks - this may be the end." And you're thinking I'm saying, "Haha, Rafa sucks and is done!"
So what I'm actually saying is this: The likelihood of another 2017 or 2013 comeback is less likely now, because he's 36-37. It could happen, but if it does it will probably be less bright and shorter in duration. So maybe "dead cat bounce" wasn't the right term, but it is more like the last jump or two of a skipping stone.