His idea wasn't even "Grindr for teens". It was worse because he wasn't proposing a separate service. His idea was to update those sites to accommodate young people. Yoth wrote: "those services should consider offering toned-down content alongside adult fare."
Even if we're charitable, Yoth's use of the word "alongside" was unfortunate. Less charitable, a serious error. It's unrealistic to expect a service with such a concentrated historical purpose for gay adults, could pivot to a harmonized family-friendly vibe for young and old.
I wonder how he landed such a role at Twitter over other applicants, and what criteria he met, that others did not.