It's disingenuous to disguise yourself as the opposite gender.
Matt just heard that one of his friends has started using a dating app to try and find a girlfriend.
Matt wants to prank his friend.
Matt hides his friend's phone, making him unable to use the app for a few hours.
Matt creates a fake female profile on the same dating app and starts messaging his friend.
Matt's friend eventually finds his phone and realizes how useless the dating app was.
Matt's friend gets excited by the messages until he realizes that it's Matt playing a prank on him, which leads him to feel embarrassed.