I agree, we all have something, like I said I cannot stand mess being on me, can't stand having my socks or sleeves a bit wet either, but they are doing the kid absolutely no favours by not teaching him how to cope, he cannot go through life avoiding it all together because at some points of his life he's going to come across it an only by teaching him how to deal with it is going to help him instead of him just having a meltdown, they could easily have wet wipes close by an let him have them whenever he needs them
I still think a lot of it is to do with dim, they were fine leaving him making a mess then all of a sudden they were back to feeding him an at the time I don't believe they ever mentioned it was because of mess, it's almost night an day with how they were with him when he was a baby till now