The president, who was not wearing a mask, claimed without evidence that 99% of U.S. coronavirus cases are "totally harmless" at the National Mall event.
"He used OUR Independence Day to tell a majority of our country that we are not welcome here in America," snapped one.
GOP Rep. Greg Gianforte's wife, Susan, met with Guilfoyle, a Trump campaign official. Neither wore a mask nor maintained social distance.
As coronavirus cases spike, public health officials are pleading with Americans to hold more muted Independence Day celebrations, but subdued is not the president's style.
Twitter users put the vice president's description down to a copy-and-paste error from the Trump campaign.
Elon Musk quickly tweeted his "full support."
"Benedict Arnold can step aside," VoteVets says in its latest anti-Trump attack ad.
The Republican Party has a conspiracy cult problem. And it's not going away.
"The absolute and total lack of shame is breathtaking. Just an utter inability to hear herself," one Twitter user responded.
"HAPPY FOURTH?" the tabloid asked in a swipe at Donald Trump's Independence Day celebration at South Dakota’s Mount Rushmore National Memorial.