Because you dislike having things said about yu which you now find are true, and realise you are a richard and people have always thought you were. You can't take it, and now you need to derail the topic fast before mroe people start seeing you as your true self.
In all seriousness, the irony of that post is overwhelming.
I am a large cunt, but in this specific instance it was not unreasonable to mock someone who does not know who such an important historical figure is. It was because of Gandhi that India is a nation. It is because of Gandhi that MLK was inspired.