Usman upset that Chantel claimed she didn’t know him, when he did the same to Courtney.
So Usman was upset Chantel pretended not to know him, when he knows Chantel has been talking smack about him online. They never met in person and Chantel obviously knows Usman.
However…
Usman pretended not to know Courtney, after they spent a whole week in Istanbul together, even spending the night in the same place. Usman said he was just playing with Courtney while they were masked, but he definitely hurt her ego and feelings by pretending he didn’t know her after they were together for a full week.
Usman just got a taste of his own medicine.