#2 Calling Dennis Siver a Nazi
This one goes way way way past the line. In his earlier days, as he was rising up the ranks in the UFC, Conor McGregor was slated to fight German, Dennis Siver, at a UFC Fight Night event.
This is one of the first glimpses that people around the world got of McGregor’s tendency to go off the rails and say things which are well beyond the realms of offensive. Taking to Twitter, McGregor decided, for some explicable reason, to called Siver a Nazi – the single worst insult you can make against a German.
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This was so offensive that McGregor actually came out and apologised for it. Imagine that, McGregor apologising for something he said. In the end, Siver would get nowhere near the revenge he would have undoubtedly dream of, as The Notorious One took him out to continue on the path to superstardom.