This user considers the singular they to be substandard English usage.
firemanfighter mankind
This user supports the use of gender-neutral language when it reasonably exists as an alternative to a common gendered word.
"There's" with a plural subject
This user knows that "there's" with a plural subject is a pervasive grammatical error. There'sThere are too many people making this mistake. Don't be one of them.
…in.
Ending a sentence with a preposition is something that this user is okay with.
than then
This user understands the difference between using "than" and "then."
their there they're
This user thinks that there are too many people who don’t know that they're worse than their own children at spelling!
your you're
This user thinks that if your grammar is incorrect, then you're in need of help.
its it's
It's really not that hard to use each word in its proper manner.