[icepush]

This condition is known as echolalia and is often associated with autism. https://en.wikipedia.org/wiki/Echolalia

[panyanyany]

However, my coworker still seems pretty normal.

[kstenerud]

That's pretty common, depending on how much skill they've developed in masking over the years.

[lofaszvanitt]

Then tell them to stop. So easy.