He was later fired by the network.
Fred Guttenberg, another Parkland survivor, tweeted that Ingraham's apology was "to save [her] advertisers".
Eleven companies have said they are pulling ads from Laura Ingraham's programme after 17-year-old David Hogg tweeted a call for a boycott.
Hogg said Ingraham's attacks were "really, really stupid", adding that the subsequent backlash shows that people are fed up with her and the scourge of gun violence. Literally no one believes that this is about her taunting Hogg now, even if it was in the beginning. She invited Hogg to appear on her show.
The Ingraham Angle airs weeknights at 10 p.m. on Fox News.
Ingraham's show runs on Fox News, part of Rupert Murdoch's Twenty-First Century Fox Inc.
In November, Fox's Sean Hannity stoked controversy by supporting Alabama Senate candidate Roy Moore despite reports of Moore's sexual advances toward teenage girls. Most are moving their ads to other programs on the Fox News schedule, according to a person familiar with those discussions.More news: Rahul takes jibe at PM on CBSE paper leak
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"Soooo @IngrahamAnglewhat are your biggest advertisers".
But her apology did not stop companies from departing.
Still, there must be a way for FNC to monetize viewer outrage that Ingraham's being targeted despite her apology.
Before long, Hogg's tweet was flooded with replies from his supporters, some of whom pasted images of their messages to the companies mentioned.
The weight-loss company told HuffPost on Friday, "We have chose to take steps to discontinue advertising on this show". We appreciate our clients' feedback on this, and we can confirm we're no longer advertising on Laura's show.
"We're changing the world", he said.
A spokesman for online travel website TripAdvisor said the company does not "condone the inappropriate comments made by this broadcaster".
"The decision of an adult to personally criticize a high school student who has lost his classmates in an unspeakable tragedy is not consistent with our values", stated Wayfair. "We do not plan to continue advertising on this particular program".
"As a company, we support open dialogue and debate on issues", Wayfair public relations director Jane Carpenter told CNBC. The #GrabYourWallet campaign reported that Johnson & Johnson has also pulled its ads from the show.