So far I have not watched anyone on the show who's come across as arrogant. I think it's very easy to misintepret someone when you don't know them. For instance, I saw posts calling Shayne arrogant but (and I could be wrong here) what I saw was someone who reacted jubilantly because, he didn't know whether he was going to get through. If he did, then perhaps he would have taken it more in his stride and acted nonchalantly. For all I know, he could have been wondering, 'Is it my turn this week?', and when his name was called out, he couldn't contain his relief and happiness.
So often contestants who I see as merely happy, confident etc. are called arrogant and it seems to me that what some may call arrogant, I interpret as confident - it's a positive as opposed to a negative interpretation.