The screenshot showed that Katie immediately responded to the fan, "Yes," with a tears-of-joy emoji.
Katie tweeted alongside the image, "Imagine your fiance has been on his [Instagram] stories for weeks in Kenya working his ass off and yet this is what some people notice," in addition to another tears-of-joy emoji.
One of Katie's followers wrote, "But 'liking' posts = love I thought," to which Katie replied in a snarky manner, "I guess that's love in 2021."
Katie went on to interact with a couple Twitter users who thought her post was funny.
"Sh-t, my husband hasn't even made an instagram to like my posts... is he cheating? Should I ask him to get an instagram and divorce him if he says no??" one person joked.
"Sounds like he doesn't love you," Katie responded sarcastically. "The least he could do is a reshare on Facebook."
And another person tweeted, "[Reddit] noticed a few weeks ago [Dean Unglert] and [Caelynn Miller-Keyes] didn't follow each other but fun fact... they've never followed each other lmao."
Katie replied, "Hahahahaha amazing."
Katie has insisted she is happily engaged to Blake after the Canadian wildlife specialist popped the question during The Bachelorette's seventeenth-season finale, which aired this past summer.
"It's hard to say the impact of that in the real world, [if he didn't propose], because you go through so much and you want to take this very seriously -- and a proposal and engagement is very serious," Katie told the magazine.
"I didn't come here to find a boyfriend. I can do that on a dating app," she added. "So it's hard to say if we would have survived just as a dating couple."
Katie said her relationship with Blake is incredibly strong now that they've promised each other forever.
"The fact that we're both committed to each other as future husband and wife, it just says a lot about our confidence in our relationship," Katie said.
Shortly after the show wrapped on TV, Katie visited Blake's hometown in Toronto, Canada and then moved into a new apartment in San Diego, CA, in August.
The former bank marketing manager and Blake also spent time together in New York City in September.
Once Blake left for Africa to continue his endangered-animal conservation efforts, Katie reportedly wrote last week on Instagram, "It can feel lonely moving to a new state... I've had trouble sleeping lately... I'm still trying to navigate this new life and city while seeking normalcy."
Katie and Blake have told multiple press outlets they are in no rush to wed and intend to travel together and learn more about each other's backgrounds, interests, hobbies and hometowns before deciding on a city in which to settle down as a couple.