'frivolous comments' is correct and usable in written English.
You can use it when referring to remarks or statements that are considered to be trivial, silly, or unimportant. Example: The speaker was cut off after making several frivolous comments.
The comments are not altogether frivolous.
Gastronomic comments ranged from the frivolous to the frightening.
The anti-domestic violence campaigner Rosie Batty has said Pauline Hanson's comments on women making frivolous court claims and seemingly rationalising violence by frustrated fathers were ill-informed and disappointing.
Combining movement with speech and vocal outcries, she tottered, screamed in horror and made disconnected comments about such serious and frivolous matters as segregation, the Supreme Court, President John F. Kennedy's assassination and Perry Como's shorts.
"It is a disgraceful comment to suggest our claim was frivolous.
And while the artist's own subjects might seem frivolous, Mr. Koons has said that they are a comment on love, life, sex, the human condition and on consumerism in today's popular culture.
The Justice Department, which did not immediately return requests for comment, has explained that this is to clear frivolous claims out of the immigration courts, which currently have a backlog of more than 600,000 cases.
Regardless, for Democrats, pairing Hunter's comments with his alleged theft of campaign funds to obtain frivolous luxury items ― including shorts he told his wife to misreport as golf balls for wounded veterans ― is an irresistible juxtaposition.
Contrary to her somewhat austere public image, she has a frivolous side and a down-to-earth outlook on those who comment on her.
The Austro-Hungarian empire before the second world war was elegant, frivolous, possessed by baroque images of death and dissolution, full of witty sidelong comments on ossified political structures, in the form of bureaucracies and castles.
