Although the questions may have sounded genuine, what followed was not. I (and others) quickly realized that its goal was not to have an actual discussion, but to bludgeon us over the head with its own opinions.
Maybe that's where the hostility comes from. Spending all this effort to talk seriously with a person, only to realize they've got their head up their own ass yelling "LA LA LA I CAN'T HEAR YOU"
Concern trolls can be identified primarily because they will retreat from, rather than engage with or be convinced by, answers to the questions they pose.
Also, its last post was a perfect example of tone policing.
The links are to a wiki about feminism, but the troll spotting tips are applicable here I think.
If you still think "billi" is not trolling, let's talk about it - I'll give you a serious reply, I promise