"I was surprised it was a red card, I thought he was going to pull a yellow card out," Adam said after the game.
"The conditions weren't great and obviously Wayne's got there before me. I've let the team down and I've let the squad down.
"I think you've got to take the conditions into account but the referee (Martin Atkinson) is happy with the decision he's made.
"I went over to see Wayne, just more or less to see if he thought it was a bad tackle. He said, 'no', but that's just the way it is. The referee makes the decision, then that's it.
"I've been in to see him and he still thinks he's happy with his decision. I'm gutted, because it's a difficult time for everyone."
Stoke are 19th in the Premier League, three points shy of safety in the relegation zone.