The difference is the republican presidents haven’t openly complained and condemned the court before the court has ruled. Sure, they complain after the fact, but never have they brazenly and openly challenged the SCOTUS to a pissing contest. It’s not that he’s complaining about the judges, it’s that he’s complaining openly and pre-emptively. It smacks of Chicago Politics where you smear the opposition to discredit them so when they make a decision you don’t like they won’t have the support of the people. So… yeah. Republican presidents have done it, but never publicly before the ruling came down. The distinction is important.