The last video he uploaded for his 11.3 million followers had subtitles; for that now-deleted video in question, he had "requested that people turn up the volume not just 'read the subtitles.'"
Pratt addressed that particular subtitle comment, explaining that "it was so people wouldn't scroll past the video on mute, thus watching and digesting the information in the video."
"I realize now doing so was incredibly insensitive to the many folks out there who depend on subtitles," he said.
Pratt noted that 38 million people in America live with some sort of hearing impairment, and said he has people in his life who are also hearing impaired.
He said: "The last thing I would want to do is offend them or anybody who suffers from hearing loss or any other disability."
The Minnesota-born star also clarified that he wanted to apologise personally, and not because his publicist told him to.
"I control my social media. Nobody else. And I'm doing this because I'm actually really sorry. Apologies are powerful. I don't dole them out Willy-Nilly.
"This is one of those moments where I screwed up and here's me begging your pardon. I hope you accept my apology."
Pratt thanked his followers for pointing out his wrongdoing and said in the future, he will focus on being "a little less ignorant about it."
The movie star noted that he thinks Instagram should have technology to add subtitles automatically to videos posted.
The father of one pushed the subject further, saying that the social media company has profited from pictures and videos he's posted, therefore he believes it should put closed captioning on the app.
Chris pitched the idea to Instagram and closed it with a hashtag: "#CCinstaNow."
