Because it's a pointless comment. Fox "News" is the leading provider of television news in the United States by a wide margin. They have a widely conservative bent and one of their anchors has nightly talks with the President.

https://www.statista.com/statistics/373814/cable-news-networ...

The claim that news can be unbiased is silly as all news has to be reported through a lens. The claim that news media has a "liberal bias" is a long standing conservative talking point going back to the 1970s where news media was listed as slightly liberal and then everyone ignored the follow that showed that media had self corrected based on the report.

Claiming that there's a "liberal news problem" just points out that conservatives don't like that "their President" is getting "unfairly attacked" by the media. This completely ignores that conservative media frequently runs literal conspiracy theories that have led to real life shootings with little regard to the outcome.

The point being that claiming that there's some grand liberal conspiracy ignores the fact that most of the news organizations OP cited will actually issue corrections. Fox news rarely issues them and most other mainstream conservative commentators never do because they claim they are "infotainment".