He had been incensed by the performance of the Irish touch judges during Saturday's meeting with Munster at Cork's Musgrave Park, where his team squeezed home 21-18.
Sean believes Glasgow would have won much more easily but for those officials and matters came to a head when Anthony Foley scored a try after using one of the touch judges, who had strayed on to the field of play, as a blocker.
"When Foley went behind the touch judge, it was almost like a planned move," Sean told The Herald. "We need to have neutral touch judges as well as referees because something very similar happened in our last match of last season, which was also in Munster. Then the man was clearly out of play prior to scoring and the referee asked the touch judge who said Yes, try'. He was smiling as he said so - I can still see that clearly.
"In some ways, it is only human nature in rugby strong-holds because these people have to live there, but it is not good for our competition.
"Other coaches are talking about it as well. We feel that Irish and Welsh touch judges give us nothing. Dan Parks can put a raking 50-metre clearance in and they will mark it 30 metres downfield.
"We feel that Scottish touch-judges tend to go the other way to be seen to be fair, but what has to happen is that we get neutrality, so that it is seen to be fair."