Donald Trump was ridiculed online on Sunday after his campaign posted a video of him appearing to wave at no one in a stadium that didn’t seem to notice him there at all. Trump over the weekend attended a NASCAR event, where he was seen watching the race and taking selfies with drivers. Upon arrival to the event, however, his campaign posted a video that caught some attention from critics. Margo Martin, the Deputy Director of Communications for Donald J. Trump for President, posted the video to her social media, writing, “President [Trump] arrives at Charlotte Motor Speedway!” Want more breaki…