Yes, he was always civil, but he had no problem making her feel squeamish - he didn’t repeat Miggs’ utterance of “c*nt”, but still referred to it. He also countered Clarice’s “…sounds like something Miggs would say”, with “not anymore”, which obviously shook Clarice. And IF he was referring to Clarice’s period with his comment, it was with a “civil” euphemism as opposed to something vulgar.