What is grammatically wrong with the following sentence?

Question

"If someone feels they haven’t been treated respectfully, the odds are they’re right."

Answer 1

Please see my answer to your last post. Note in this sentence there are two pronoun errors.

We'll be glad to check your answer.

Answer 2

It would be better here to change the subject noun than to change the pronouns.

Answer 3

So would I change it to the following:
The word someone is singular. Therefore you would change they’re to he or she.

Answer 4

You could do it that way -- but Guru's suggestion is better and not as awkward. Change someone to a plural pronoun.

Answer 5

Or a plural noun.