Bob Pittman’s money-losing iHeartCommunications is frustrating creditors by making a not-so-generous offer as restructuring talks begin.

The country’s biggest radio station operator said in a filing it wanted to decrease its interest rate by three-quarters of a percentage point and get a one-year extension on its $21 billion in debt.

“I think it was nonsense,” a senior creditor who is often seen as friendly to issuers told The Post.

iHeart made the offer public as a trial started in Texas. Some senior creditors charge the company tripped loan covenants.

The creditors allege iHeart took a $200 million dividend from its 90 percent-owned Clear Channel Outdoor that should be theirs and placed it in a subsidiary that is likely to retire junior loans later this year.