i-adjective
argumentative; quarrelsome; given to reasoning
Describes a person who tends to argue or insist on logic, often in a tiresome or pedantic way. Can be used for someone who always has to have the last word.
彼は理屈っぽいから、議論すると疲れる。
He's so argumentative that debating with him is exhausting.
理屈っぽい人と話
It's a pain to talk with someone who's always splitting hairs.