snoot

My colleague is such a snoot that he corrects people's grammar even in informal chats.

我同事是个语言洁癖者，连非正式聊天里都要纠正别人的语法。

I don't want to sound like a snoot, but 'whom' is the correct word in that sentence.

我不想听起来像个咬文嚼字的人，但那个句子里用 whom 才对。

Snoots who constantly correct every tiny grammar mistake are often ignored.

那些总是纠正每一个微小语法错误的语言洁癖者，常常会被人无视。