I read an article recently suggesting several examples of conversations that should be considered taboo in the office. The short list reads like a list of juicy conversations: politics, religion, sex, personal health, life dramas and career aspirations. The idea is that any of these can evoke angst in people you're trying to impress, influence or manipulate.
I would not suggest the point is to work overtime trying to deny and avoid meaningful conversations. I think a high engagement culture values and appreciates meaningful conversations that connect people in new and positive ways, that build trust and resonance.