Absolutely right, their players went mental when he was red-carded and it was a legitimate decision. The 'keeper's actions were easily punishable by a red card, as the ref said afterwards he did not try to evade the attacker and kicked him more than once, whilst he was on the floor also. Red card.
I thought that the first time I watched it and I think the ref made the right decision at the time. But when I watched it a couple more times and I'm not so sure, the keeper does genuinely appear scared for his safety as he almost takes one of the stewards out as well by mistake. Easy to understand reacting like that when someone attacks you out of nowhere.