Otherwise you could be accused of causing the statement by your question. Rfre, it sounds like you are baiting the coach. You are trying to get the guy to self incriminate. If the words warranted an ejection, then you don't need the self incrimination. It's a profession.
Great refs understand that managing a difficult coach requires great skill.
They aren't interested in revenge or showing the coach up. They are more interested in protecting the ongoing game using all their formidable skills and tools.