As a person of color, I would much rather even the most offensive words be spelled out on the screen rather than misunderstand the research. There is an understanding that this is a research context and no one is called anyone else at the conference that name. This has also been standard practice in the (admittedly few) times I've come across this. People refrain from saying to workthe words out loud in the presentation, although I suspect this is due to the presenter perceiving a stronger stigma against it rather than other people minding.