I can't speak to twitter but I'm convinced that reddit is a grooming site. Spend any amount of time in the trans subs and it becomes readily apparent that they're populated--seemingly exclusively--by teenagers, for whom the pedo admins have created an environment censorious of any heresy against queer theory. The isolation resulting from lockdowns and school closures forced people online more, which means more time in echo chambers for reddit's trans userbase and helps explain the steep rise in insanity. Finally, contemporary trans activism is tailor-made for Narcissists, and reddit is a place where they can go and get showered in affirmations and enact/demand retribution against anyone who threatens their fragile self-worth.

I'd accept that if someone was making this statement to deny someones gender identity it could be offensive, but when made clearly as a statement of biological fact the controversy is unwarranted.

As for this, while I have seen some trans people on reddit insist that they literally are the opposite sex, most are hellbent on selling the fiction of "man" and "woman" as social constructs, distinct from male and female, which is why people can usually get away with referring to transwomen as male but will catch a ban for calling them men.