Mueller has sued Swift, claiming he was falsely accused and lost his job.
Mueller, then a host on the top-rated radio station KYGO, had been invited to meet the star before the show. During a 2013 concert in Denver, a DJ called DJ David Mueller posed for a photo with Taylor and his girlfriend.
When pressed if she thought Mueller got what he deserved when he was sacked, Taylor said: "I don't feel anything about Mr. Mueller".
Mueller claims that when Swift falsely accused him of grabbing her rear-end, he was sacked from his job and hasn't been able to find radio work since. "As a parent it made me question why I taught her to be so polite".
The 27-year-old, famous for hits such as Bad Blood and Shake It Off, gave her account in court on Thursday. She countersued one month later, describing the groping incident as "completely intentional".
She dismissed attempts to dissuade her from her story and rejected the suggestion that she had continued greeting guests for as long as 30 minutes after the alleged assault, as if nothing had happened. "We are a big group of creative woman who are supporting her as an artist and we love what she does", she said.
"Baldridge also repeatedly asked Mueller if he could grasp "any reason, incentive or motive" for Swift to make up the allegation or be involved in two years of litigation". She's trying to tell people out there that you can say no when someone puts their hand on you. "I felt like I wanted to vomit".
McFarland also noted that Swift was closer to Melcher than Mueller in the photo.
She testified that Swift later told her what happened, looked at a photo and pointed out Mueller as the person responsible.
Swift counter-sued for assault and battery, asking for damages of $1. "He stayed latched on as I lurched away from him".
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Michelle Carter has been sentenced to 2.5 months in jail having been found guilty of involuntary manslaughter by a court in MA . Like Carter's trial, Knox's case drew worldwide media attention, with many presuming guilt prior to the verdict being reached.
The photographer who took pictures at the meet and greet told the court she thought Swift had made a amusing move during the photo, at first believing she had tripped. She is expected to take the witness stand herself later in the trial.
'It was a definite grab.
And in true mic drop fashion, her attorney simply addressed the judge and said, "Absolutely no further questions, your honor".
"I 100 percent believe this is a case of a woman's right to her own body, even men's rights to their own bodies", said Laura Brandon, a trial spectator.
The singer's mother, Andrea Swift, was earlier called as a witness by Mueller's lawyer, Gabriel McFarland, and her testimony was anything but favourable to the former DJ for radio station KYGO-FM.
Wednesday's testimony highlighted an initial attempt to keep the encounter in Denver out of the spotlight.
Testimony in Taylor Swift's lawsuit trial accusing a former Denver DJ of groping her has been delayed while the judge holds a closed hearing to discuss evidence.
She said she didn't contact police in order to protect her daughter, saying she didn't want the incident to "define her life".
She later informed Mueller's radio station, KYGO, which subsequently launched an internal investigation that resulted in Mueller's termination.
While some members of the public have happily bowed at her brogued feet, others have simply refused to buy into the star's "wholesome" image.