The person i replied to seems to think that any criticism of Biden is an endorsement of Trump.
Biden should absolutely be criticised for the Palestine genocide and other things as needed. But that’s not what you did. You said you’d not vote for him which effectively supports Trump. If Trump had shown any indication that he’d handle this (or any important) issue any better, then sure, that could make sense. But this is just cutting everyone’s nose off to spite your face.