If he’s one to meet skanks online for sex, perhaps the skank was correct that she didn’t have chlamydia. Maybe he caught it by being a skank with someone else.
Yes, that's possible, although some of these Gen-Z guys are not ashamed to share their lifestyle stories, so he has no reason to lie - and their peers mostly could not care less. We have indeed produced a society that has less shame and almost no standards for sexual morality. This one guy was kind of an "incel" who generally prefers video-games and watching sports to chasing women.
I'm "the old guy" because I told them I got married young and have been married to the same woman for almost 25 years. I try to counsel them in a non-judgmental way