"bitterly criticize" is a correct and usable phrase in written English
It means to express strong disapproval or harsh judgement towards someone or something. Example: The politician's opponent bitterly criticized his recent actions in a scathing public statement.
Dirk Johnson (NYT OTHERR STATE RACES ILLINOIS CAMPAIGN FINANCE, PART 2 -- In a race for a seat on the Illinois Supreme Court, two Republican candidates in next Tuesday's primary have spent more than $1 million apiece, while a third has been mailing fliers that bitterly criticize his foes.
Instead, different people trust different sources, and these sources bitterly criticize each other.
Likewise, activists belonging to the opposition parties also complain that even professional editors trash their online comments which bitterly criticize the policies of the army.
Implication: People who bitterly criticize one country for doing something and do not criticize other countries in similar situations when they do the same thing are not necessarily anti-Semitic or anti-Muslim, but it is a red flag.
Indeed, Shenyang has been bitterly criticized for wasteful spending.
Plant breeders and seedsmen bitterly criticized Fowler and Mooney for politicizing the debate about genetic resources.
Still, environmental groups bitterly criticized Mr. Ford after the Senate vote, as they criticized most automakers.
I've watched that over the past two weeks, you have been bitterly criticized and broadly characterized.
Mr. Ma distanced himself from Mr. Tung today, bitterly criticizing his leadership.
He was bitterly criticized for opposing immediate withdrawal of American troops from Vietnam.
This offer, too, was bitterly criticized, and Frick soon withdrew it.
