Student or Learner
With what prepositions can "nitpick" be used as a verb?
1) He likes to nitpick at me.
2) He likes to nitpick on me.
3) He likes to nitpick me.
to criticize by focusing on inconsequential details.
They are all unnatural. You could say "He nitpicks all the time".
I don't have a problem with "he nitpicks me."
For me, it's more natural to use a direct object, but not a person as that object.
He nitpicks everything I say.
He nitpicks everything I write.
This is likely one of those words that gets used differently and since it's a rather informal word, I couldn't say that I find either bhai's use or Dave's use "wrong."
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.
I'd mostly use it intransitively or like Barb, though He nitpicks me makes perfect sense. Maybe it's time to start using it.