If you criticize Biden's obvious mental decline, you are being ageist and ableist.
You're also being racist and sexist because it's clear that you don't trust Kamala Harris to take over.
I don't agree with the latter. I believe that people don't want Harris because they think she doesn't have a chance against Trump.
Biden has given too little exposure to Harris, and the Democrats have failed to identify a credible substitute for Biden. Now it's too late.
At least they carved an exception for Bernie. It was not antisemitic to say he was too old in 2016 when he was... checks notes... way younger than both of the current contenders.