I am surprised that this sort of behaviour occurs in dojos. I've always been taught to respect training partners and the dignity of a dojo. I must have lead a very sheltered aikidoka training life because I have never seen this happen in about 16 years of martial arts training. I would think that this is counter productive to the spirit of learning and a breach of dojo etiquette.
I think that Mr Goldsbury puts it very well and I think that the Sensei of the Dojo along with other yundansha would need to deal with the situation. I am heartened that both apologised to each other after the event but I do hope that this incident does not affect the tone of future training.