stubborn, take Ross in Friends Season as an example.

Stubborn, caring little things that do not matter at all, not reasonable...

钻牛角尖 (hair-splitting) zuān niú jiǎo jiān 比喻费力研究不值得研究或无法解决的问题。也指思想方法狭窄。（多为贬义）eg. He is such a hair-splitter, so you’d better not argue with him. 他老钻牛角尖，所以你最好不要和他争辩。