Well if on one hand the accusation can end your life and carreer, you can't then turn around and say there's nothing to it because everyone's a racist. It can't be both.
It can, because the career-ending thing is a completely different phenomenon, it's this weird public-shaming bandwagon thing, and it happens when some popular figure/blog/site decides to try to virally drag someone for something, as you say, relatively innocuous.
Then once you have hundreds of thousands of people engaged, it stops mattering that most of them are sensible and just think 'hah, wow that was in bad taste' because a few of them are in fact those perpetually super angry types who are going to go parading a quote around as evidence of what an awful person this must be. One of the real problems here is that the unconsidered anger of that bandwagon, once it gets going, has clout because companies are so terrified of bad PR.
For people whose comments don't escape their social circles and end up on millions of screens, the accusation doesn't end their life and career.
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