The Football Association have charged Saints with failing to control their players after referee Mark Clattenburg ruled that Luke Shaw pushed Grant Holt just inside the penalty area.
Artur Boruc kept out Holt's subsequent spot-kick, but Southampton players continued to protest after the final whistle in the 0-0 draw and were joined on the pitch by manager Mauricio Pochettino.
The club have until 4pm on Friday to respond to the charge.
"If people cross the line, then of course you have to be charged, but I think at that moment we were fighting to keep that clean sheet," Hooiveld said.
"We had fought the whole of what was a tough game and tough circumstances, then they were awarded a penalty which in our eyes was not the right decision.
"Then the emotions went a little bit high and maybe we got a little too close. I think whatever happens after that, it is not up to us to decide."
Asked if Southampton had been out of order, Hooiveld added: "Not really. I think it is also in the moment in which it happened and how it happened.
"Football is a game of emotions and of course it has to be directed in the right way.
"But sometimes if you feel you have been done an injustice as a football player you lose your head a little bit. I think that's what happened and what is going to happen, I don't really know."
- Sports & Recreation
- The Football Association
- Grant Holt
- Mark Clattenburg
- Artur Boruc