[user104658]

This is a slightly tough one because the context of why the term is considered a slur rather than just offensively outdated is mostly specific to the US and South Africa, where it HAS historically been used in a negative way. My impression is that in the UK itself (whilst it's still outdated) it wasn't really historically used offensively (for the mostpart), more just synonymously with modern terms.

Sounds like he hasn't been booted though - he's decided to leave because of the accusation and the implications of it (on him personally and professionally), which is fair and understandable all round.

I would say though... people going on television really need to be especially careful with their words, and often are... not. Like if in any doubt just don't.