We have a recent uptick in troll activity.
The general advice is: Do not feed the troll.
Based on my own past experience this is sound advice. There is no use arguing with a troll. If he does not like what you wrote he will disagree and insult you without any reason. If you are suspicous of someone you can look at their profile. How they react to disagreement usually shows under downvoted or closed questions. To be fair, critique is upsetting to most people.
If you would save your time, stay away from questions posted by trolls.
This was not really intended as a question but it made me think of one:
Does SE have any way of dealing with trolls? E.g.: IP ban or something if user gets 100 flags?