People obsess over these cheap, dumb jokes because lolcows get mad at them, and people like to fuck with lolcows.
Incidentally, death threats on the internet are meaningless, as is doxing, usually, unless it's credit card info or something like that. Worst case scenario people order pizzas to your house, which is kind of shit if you're on a diet, but usually inconvenient at best, annoying at worst.
Finally, from my experience, most trans members here get treated exactly as your average member would.