Hi guys, it's exam time again! (yayyyyy). What's the difference between these two when using them as a "Clause 1 に対する／対して Clause 2" stucture? The definitions I got off Jisho are as …

Why is [食う」　considered vulgar by my dictionary? Is there ever a good time to use this word, because i think it sounds cooler than 「食べる」 ありがとうございます。