I'll start by answering your question: yes, if you believe a question (or answer) is an attempt at trolling, and not a genuine good-faith post, then flag it as rude/abusive. I've done the same with troll posts on other SE sites.
But for what it's worth: I don't believe that the user in question is a troll. Rather, I believe they simply haven't learned how to articulate their questions in a way that fits StackExchange's guidelines. To wit:
- Their three previous questions here on Skeptics all essentially consisted of the same thing: "Here's this quote I found from/about a WW2 Axis leader, is it real?" All three required substantial edits to bring them up to our quality standards, but it seems the user didn't realise (or wasn't told) that these edits were necessary, and why.
- Of their other SE accounts, they had a (now also deleted) question on SO that consisted of a single sentence and was closed at -4, and at least one deleted question on Politics.SE that I can't see.
I'll admit that their previous question was a little concerning: their quote was again from Wikipedia, and they ignored all five of its sources on the basis that "they seemed anti-Semitic", without any further explanation. But for now, I think Hanlon's razor applies: they look less like a troll to me, and more like someone who just needs to be shown the ropes.