This skirts a taboo that you can barely talk about: that personal preferences in dating are not judged to the same standard, and that movements of empowerment and positivity are clashing with everyone's free will in pursuing -- and especially articulating -- what they do and don't like. Declining to date someone because they're fat is now firmly seen as a bullying tactic, but not dating someone because they're short is perfectly fine. The protocols around communicating preferences to others and getting them accepted by one's peers is a quagmire where social conventions haven't ventured, so everyone lies for self-preservation ("I like you as a friend", "I don't wanna be tied down"), and those left out are left to draw their own conclusions.
This is all terribly unfortunate, but not really new; the incel movement, however, feeds not solely on rejection and obsessing over the base biological reasons thereof, but the implicit entitlement they they'd deserve otherwise.