As long as Ten Hag is still United's coach, it is highly recommended not to bet on United. I already thought United would have a hard time winning against Tottenham. but I didn't think that a 0-3 score would embarrass United at home.
Playing with 11 players I think it will still be difficult for United. especially with 10 players, it is clearly a hard blow for Ten Hag and an important consideration for the club to be able to correct Ten Hag's performance.
The image without words obviously illustrates the frustration of Manchester united fans now on ETH.

With or without the red card that puts United to a 10 men Tottenham would have still won the game because even before the Bruno Fernandes was sent off at 42 minutes they were not having a good game but struggling as Tottenham were already dominating the game at then. The red card only made things a lot more easier for Spurs and they didn't hesitate to take the chance.
Don't know why the Glaziers still have hope on ETH to have not shown him the exit door, don't know what they see in him that we're not seeing. Arsenal had a red card against Manchester City last weekend but didn't conceded a defeat in an away game, which makes it very clear that Erik Ten Hag has no excuse for this shameless defeat and should accept it that he's out of ideas for the team's improvement.
PS: The image above isn't originally mine, got it from the WhatsApp status of a Manchester united fan who happens to be my friend.