Donald TrumpAnna Wintour when asked by James Corden who she would never invite to the Met Gala answered Donald Trump. So it is sure that he will not make it to the guest list anytime.
Tim GunnIt is sure that Tim Gunn has been banned from Met gala from what he said in 2016 when asked what "his unforgettable moment in fashion was" to Fashion Police. That started a war between Gunn and Wintour.
Amy SchumerShe hasn't permanently been banned from the Met Gala but she is not much a fan of the vent either, as she explained at the 2016 interview with Howard Stern.
Rachel Zoe“"Anna Wintour is one of my heroes, but they say that I’m more influential, "a statement made by Rachel Zoe is rumored to have cut her out of Met gala. But she did appear at the red carpet in 2012, 5 years after making the statement.
Demi LovatoThe singer described her Met Gala experience as "terrible " in an interview with Billboard in 2018.
Gwyneth PaltrowThe actress described her Met Gala experience as "it sucked" at the Kyle and Jackie O Show in 2013. But she did return to the red carpet in 2017.
Tina FeyThe comedian in 2015 told David Letterman told that the event was a jerk parade in 2015.
Zayn MalikThe singer with his then girlfriend Gigi Hadid had walked up the red carpet in 2016, but he won't probably do it again. The singer said that he would be interested in something more productive.