Instead of ignoring Ms. Miller, Ms. Linton — whose account had been public — replied with snark. (Ms. Linton changed her Instagram account to a private setting soon after the photograph was posted.)

“Aw!!! Did you think this was a personal trip?! Adorable!” she wrote. “Do you think the US govt paid for our honeymoon or personal travel?! Lololol. Have you given more to the economy than me and my husband? Either as an individual earner in taxes OR in self sacrifice to your country?”

Ms. Linton went on: “I’m pretty sure we paid more taxes toward our day ‘trip’ than you did. Pretty sure the amount we sacrifice per year is a lot more than you’d be willing to sacrifice if the choice was yours.” After that, she included emojis of a curled bicep and a face blowing a kiss.