Is it a phrase you used first?

I curse like a sailor in session. All the time.

At first, my T would change my words when repeating them back to me.

For instance, when he would bring something up I didn't want to talk about, I would ask to change the subject, and he would say "We can change the subject for now, but I'm afraid I'm going to have bring it up again before we finish."

And I would mutter, "You're a pain in the ***." half-heartedly, and he'd smile.

Then he'd say, when the time came, "I have to be... a pest now, and bring up such and such again."

But that was in the first two months or so of getting to know me.

Now, when the same thing happened last week, when I accused of being a pain in the ***, when it came back to the taboo session, he'd just say "I'm afraid I have to be a pain in the *** now..."

My point is, it might be something s/he's doing to try to set you more at ease, use language that they think YOU would use.

Regardless if you said it first, or s/he did, if it bothers you, say something!