Sarries' Australian lock Skelton slapped the GB Olympic Sevens Rio silver medallist in the face late in the 22-22 European Champions Cup draw.
BBC pundit Brian Moore was among those to accuse Davies, 26, of over-reacting.
"It's not good is it? If one of our players did that I'd be devastated," said McCall.
"But I don't think they would. It's terrible, but you don't need me to tell you that."
Moore wrote: "Scarlets should have won but, had they done so, it would have been spoiled by another example of simulation (cheating by exaggeration) from Davies."
Scarlets head coach Pivac defended Davies' behaviour - and questioned how clean former England hooker Moore was as a player.
"I've spoken to our medical staff, and they tell me he [Davies] is getting acupuncture on his neck," Pivac said.
"The facts speak for themselves: 140kg, swinging arm, hit him on the chin. We've confirmed that.
"Unless you've been hit by 140kg or been struck on the jaw, you really should keep your comments to yourself.
"James tells me it [falling over] was more shock from being struck. He fell to the ground and he got straight back up.
"If I was the Saracens coach I'd be sanctioning my player for throwing a punch which is against the rules of the game."
Asked about Moore's criticism, Pivac added: "I don't condone taking a dive, that's why I don't watch football.
"Brian Moore? Well, he was squeaky clean as a player wasn't he?"

It is not binding on the government, which said it would be a mistake to give guarantees to EU nationals in the UK without similar concessions for UK nationals living elsewhere in the EU.
How do the numbers compare?
The UK has a population of 63.7 million, of which 5.3 million (8%) are non-British, and just over half of those - 2.9 million (5%) - are from Europe.
Just under 1.2 million UK nationals live elsewhere in the EU.
Of the non-British population from EU countries, the largest group was Polish nationals, with about 853,000, according to the latest Office for National Statistics (ONS) Population of the United Kingdom by Country of Birth and Nationality report.
The Irish were the second-largest group, with 331,000 residing here. Romanian and Portuguese nationals are in joint third place, with 175,000 people from each country living in Britain.
These figures include only those living in the UK for at least a year.
Polish Prime Minister Beata Szydlo has already said that the country would work in negotiations to "ensure that Poles living in Great Britain retain their privileges".
The Irish government has also announced its contingency plans now that the UK has voted to leave the EU, including making preparations for increased numbers of UK citizens applying for Irish passports.
Of those 2.9 million EU nationals living in the UK, about 2.15 million are working.
Five years ago that figure was 1.33 million and 10 years ago it was 758,000.
There are about 1.19 million non-UK nationals from outside the EU working in the UK.
The figure of just under 1.2 million UK nationals living in the rest of the EU comes from the United Nations.
These are the best statistics available, although they are not perfect, with some countries counting international migrants by birthplace while others judge by the passport someone holds.
Of the 27 EU countries, Spain had the most UK nationals with just under 310,000 migrants from the UK living there in 2015. Ireland was second with 255,000 and France third with 185,000.
Of those UK nationals in Spain, 106,610 were claiming the UK state pension, according to figures from the Department for Work and Pensions, while 133,250 pensioners were living in the Republic of Ireland.
Read more: The facts behind claims about our relationship with the EU

Kenneth David Dickie, 64, was found with a serious head injury at the Rockley Park site in Poole on Sunday 8 May.
A 34-year-old man from Poole appeared before magistrates on 10 May charged with causing grievous bodily harm.
A woman, aged 57, arrested on suspicion of grievous bodily harm with intent and perverting the course of justice, has been bailed until July.
Dorset Police said Mr Dickie died from his injuries on Saturday at Southampton General Hospital.
Saracens boss Mark McCall has criticised Scarlets' James Davies after Will Skelton was sin-binned during the meeting of the side last weekend.
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On 6 July, a motion in the House of Commons calling on the government to guarantee the rights of EU nationals living in the UK was passed by 245 votes to two.
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A man injured in an alleged assault at a Dorset holiday park has died.