While there is no doubt the captioning was a problem, and that went viral, I doubt if it was intentional on the part of C4. It often happens that the captions that are automatically generated get it wrong and then have to be manually corrected. I have seen it many times: one of my favourites was when the presenter said "here are the latest borrowing figures" and the caption came up "Here are the latest boring figures." Mistakes like this happen when you are trying to do this automatically. This is a particularly unfortunate one and C4 corrected it and apologised quickly, but not quite quickly enough to stop those who want to capturing it and making complaints about it (and there may be different people in each group)