Moyes said: "The conversations (I had with the squad following the Crystal Palace game) will be private between me and the players, but I wouldn't change my wording, that's for sure, because that's the way I felt and I would say we let an awful lot of supporters down on the day.
"Overall, Palace played well and we didn't and we were very poor, so what we want is a reaction from the players. We want to show what it means to play for West Ham, a bit of pride, and hopefully we can show that.
"We're eighth in the Premier League at the moment, with four games to go and we're just about to go into May. It's an incredible position to be in, and we've been in it nearly all the season.
"We've also being competing in Europe so have probably played 12 or 13 games more than any of the teams who weren't in Europe.
"Liverpool have also played a lot of games but, to be fair to them, they've got used to it over many years.
"From our point of view, we're in there, we're still in with a shout with four games to go and we'll try to make Europe and it would be a great achievement to make it four years in a row.
"Our start was incredibly good against Bayer Leverkusen, we got in front and should have been two or three goals up, so (poor starts are) not a regular thing, but I will say I was ashamed that we were four goals down after 30 minutes at Palace, I really was.
"I don't think my teams over the years have done that, so I don't like it, I didn't like it at the time and certainly didn't like it after the event either. I hope that I can make sure that doesn't happen in the future but in football you never can tell. We need to defend better generally and that comes from number one in number eleven on the team.
"I've been around football a long time, been involved in managing a lot of games and players can be different. Sometimes they might not say too much but perform greatly, but sometimes they can perform in training and it doesn't work, so there is no magic formula to get back on track, but a good dose of hard work is a good place to start."