Logan and I deal with this constantly. A pictureless, a profileless, an ab-only shot, a complete stranger, saying some thing or that, and when we say I'm sorry I'm not interested they lash out.
For whatever reason, online folks, and especially online gay folks, seem very polar and seem to have extremely bad decorum.
The best choice is to ignore. Over the years, we have folks who "dig" on us, but, we understand their personality, and take it with a grain of salt.
It's funny how a skinny, or a fat, or dumb, guy can go from adoration to venomous in literally seconds, confirming the original judgment on the guys.
It's like, "I like you, therefore, you should like me, even though you know nothing about me." They are some pretty messed up creatures.
You just cast them off into The Pestiverse.
Somehow, they must feel indemnified by lashing out at a complete stranger, half a world away. In their own convoluted world, perhaps it gives them the last word. Who knows.