But in the latest incident of a bad-tempered series, Warner appeared to react to a comment from a spectator in the members' pavilion, stopping and turning as he climbed the steps to the dressing room.
Lehmann labelled as "disgraceful" behaviour by some spectators on Friday and said he has lodged an official complaint.
"Banter, that's fine. Banter is good-natured fun by crowds b ut they've gone too far here.it's been poor".
The mask stunt had repercussions for South Africa's cricket body when two of its senior officials were photographed smiling with some of the fans wearing the masks.
Cricket contests between Australia and South Africa have crossed the line before this series, although this one has been particularly ill-tempered. Between first two Test matches, offensive masks were distributed by fans in reference to her brief bathroom encounter with the rugby league player Sonny Bill Williams years before she and Warner became a couple.
Morkel was dropped after the first Test defeat in Durban but came back into the team after Lungi Ngidi, who bowled well in the second Test victory in Port Elizabeth, was not 100 per cent fit due a toe niggle. When we play in Australia. "When we play in Australia, I have played in Melbourne, I have copped the same sort of abuse".
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Like Rabada, Morkel lost some of the limelight he deserved because of the fan issues.
"It was a bit of a disappointment that we didn't get that wicket earlier", said Morkel.
In reply, David Warner got the Australian innings off to a typically rapid start, smashing 30 from 14 balls, before he was clean bowled for a third consecutive time in the series - Kagiso Rabada (3-81) sending the stumps splattering. Clearly intent on stamping himself on this match, Warner crunched three successive deliveries through the off side for boundaries to end Rabada's second over, and began his third by hooking a six and slashing another four behind point.
It might have been even better for South Africa if tailender Nathan Lyon hadn't launched an adventurous counterattack for Australia, when he thumped 47 off 38 balls in a 66-run partnership for the ninth wicket with Tim Paine (33 not out).
There were no heated confrontations or over-the-top wicket celebrations, but as fate would have it, day one still had a dose of controversy when video replays showed Cummins standing on the ball with his spikes. The left-hander carried his bat by remaining unbeaten on 141. Rabada finished with four wickets, as did fellow pace bowler Morne Morkel. Shaun Marsh added 78 for the fourth wicket with Bancroft but again failed to build on a start when he chased a wide one from Morkel and gained a thick edge through to Quinton de Kock.
There was no immediate response from Cricket South Africa.