This show is such BS. Anyone could have seen a mile away that Jephte and Shawneice would be a mismatch. I think she is insecure and/or senses that he's not going there with her, which is only making her nervous and overreact, pressing the same button over and over again thinking maybe she'll get a response this time. She needs to hang back but she's so afraid of silence that she is compelled to continue to try to fill in the gaps. But the more outrageous she gets the more she turns him off and so he withdraws even more. And so it becomes a vicious circle. How she doesn't realize how this is turning him off is a mystery. She may realize it on some level but be unable to control herself because she is THAT nervous.
Judging from his strong mother and his dynamic with her, I'd say Jephte was raised with strict moral and social values, possibly with a strong church background. If that's the case it explains why he would be so put off by Shaneice's blunt vulgarity. Also, I think he is an idealist and thought he would be matched with someone that had a complementary outlook on things, not someone at the extreme end of the spectrum. I think he could be an introvert but it's hard to tell with him retreating from her all the time. Anyone would look like an introvert at the receiving end of her cringe-inducing behavior. Who would want to encourage THAT? It's creepy. I think this show has had a few introverts. Nick was a self-professed one and the experts always called Ashley (the one with David) one. I could believe it with both of them.