Jarrod Bowen admits West Ham United were extremely frustrated after Sunday's draw with Arsenal.
The Hammers blew a 3-0 lead at the London Stadium.
"We're frustrated as anything," Bowen told the club's website. "Especially because we started so well in that first 30 minutes and went three goals up.
"We should have put the game to bed, which we felt we did, but we dropped and dropped and invited pressure.
"You can't do that for 45 minutes in a game and expect to get away with it. We got punished for the way we came out in the second half
"We wanted to start on the front foot again, but we didn't and got punished for it.
"You have to pay respect to Arsenal, they are a good side and you know there will be spells in the game when you're under pressure, but we invited too much of it.
"We put our stamp on the game in the first 30 minutes and got the three goals, then we had chances at 3-2, so we're disappointed and frustrated [not to win the game]."