Yahoo Sports Swans should have fought before full-time - Williams
Luke Williams said Swansea City's players should have shown fight during the south Wales derby rather than after the final whistle on a "dreadful day" for his side at Cardiff City.
Swansea suffered their heaviest league defeat to Cardiff since 1965 as a second-half double from Callum Robinson and Dimitrios Goutas' header gave the Bluebirds a 3-0 win.
Cardiff boss Omer Riza was shown a red card in stoppage time after coming on to the pitch following a touchline skirmish with Swansea midfielder Goncalo Franco.
And there were ugly scenes after full time as players and staff had to be separated after a lengthy melee.
When asked about the post-match flare-up, Williams said: "From our point of view it's pathetic.
"If we think that's going to in some way take attention away from a shoddy performance, we're very much mistaken.
"The time for fighting was on the pitch, fighting for the ball, fighting for our fans to make one more run forward, to make one more tackle, to jump for one more header, to try to make one more action to the box, to try to make one more recovery run when your legs have gone.
"That's fighting, not scrapping on the pitch and swearing and pushing. That's pathetic."
Swansea's head coach admitted he is "fearful" over what punishment Swansea will face for their part in their confrontation.
A Football Association investigation looks a certainty, while it may be that individual players face sanctions.
"For me it's a problem because we lost control of the emotions in the same way we lost control of the game," Williams added.
"The scrap at the end is a reflection of the game. We completely lost control and then started to make terrible decisions, try to make distractions from the performance."
Before this weekend, Swansea had won five of their past seven games against Cardiff.
They made the short trip east in confident mood, with Williams' team in mid-table while the Bluebirds are scrapping to pull clear of relegation danger.
Yet Swansea never got going at Cardiff City Stadium. There was little to choose between the teams during a cagey opening half hour, but Cardiff began to apply pressure late in the first half and then took control after the break.
"For half an hour, no problem at all," Williams said. "Then we start to be under pressure, we started to be sloppy and we were not aggressive enough when the ball was up for grabs.
"Then it looked like people started to not feel so confident with the ball."
The Cardiff loss means Swansea are without a win in four matches in all competitions ahead of Tuesday's home game against promotion-chasing Sheffield United.
When asked whether the Bluebirds had wanted derby victory more than his team, Williams added: "It looked that way because they got the upper hand on us. We just weren't able to cope with that.
"The players know what the fixture is about. Everybody's up for the game and everybody's well prepared, but we lost a grip of the game and we were never able to get a foothold again."
Williams felt Riza's late dismissal was the result of the Cardiff boss and Franco "being in the wrong place at the wrong time".
"We're not meant to leave our technical area, but honestly you lose your bearings there and Omer just lost exactly where he was," he said.
"It looked like he was trying to collect the ball as it came off the pitch and Goncalo was trying to keep it on the pitch. It's an unfortunate scenario."
