Comments on Word Usage in Modern Times

I just came across the rules at left, and thought I’d make a few comments:

1) The word “their” in the sentence “Each student (singular) should bring their (plural) book,” is a workaround for “Each student should bring his or her book.”  Since the latter is clumsy, I prefer, “Each student should bring his book.” This is sexist, of course (why not “her?”) Yet, I think this is the best option.

2) “Ain’t” is most definitely a real word; it’s slang for “isn’t,” and should be used in appropriate settings, e.g., “Farmer Bob said, ‘My corn crop ain’t what it was last year.'”

3) I see no reason that emoji/emojis should be treated differently than any other noun.

4) Misusing “literally” like this merely shows one’s ignorance. I know it’s common among young undereducated people, and I’m sure it works in conversations with their peers.  I can assure you that it wouldn’t work at all in job interviews for med-law school, Deloitte, Boston Consulting, etc.

5) “Impactful” is a legitimate word, and I can’t understand why some people (pedants?) are critical of its use.