Mr. Tsipras promised to use Greek voters’ overwhelming rejection of creditors’ bailout proposals to bring home better terms and less austerity in exchange for a generous rescue package from Europe. He demanded debt relief from eurozone countries.

Instead, Mr. Tsipras drafted proposals more onerous than the ones the majority of Greeks had rejected, leaving those who backed him in the referendum scratching their heads.

“So I voted for ‘no,’ but in fact it meant ‘yes,’ ” Ms. Christoforidi said, sprinkling a cappuccino with cinnamon. “Is this some kind of joke?”

Others said they were relieved that the Greek premier was now pushing for some kind of agreement, even if it was worse than what the nation had rejected. Still, they were angry that negotiations were proving so tough.

“Look, Tsipras has completely messed up in the handling of this crisis,” said lawyer Vassilis Vlastos. “I voted against the proposals in the referendum to help him get better terms, but now it seems even that wasn’t enough.” “He’s done the deed, he’s gone back to the negotiating table to sacrifice more to keep Greece in the euro, and the Germans still won’t take it. They just want us out, no matter what.”