Robatoy wrote:

Not interested, dick head.

But if I were interested, its uses not use's, Frog bait!

Learn to spell it's, ****-nozzle.

His spelling of "its" is correct. Your use of "they're" is wrong.

But don't despair. The law of apostrophes states that "For every
inappropriate use of an apostrophe, somewhere in the universe there
is another inappropriate use."

In the sentence:
But if I were interested, its uses not use's, Frog bait!
its stands for it is in the above sentence... abbreviated that becomes
it's. Its is possessive.

You're best to keep your corrections accurate. There is no way to
change their minds, They're just too ...whatever..

...and I keep on teaching.

I was wrong.

In my defense, the 17-year-old Mexican girl I hired to do the housework was
under my desk at the time, trying to pull down my trousers, and I got
distracted.