It's not arrogance, it's authority. Just because someone might have a better idea than you does not mean you have to agree with people spewing stupidities. Especially when the said people didn't even bother coming up with their own stupidities (which warrants at least a modicum of respect).

Perhaps you might re-read the first paragraph which ends with but I am very aware of the vast state of my ignorance and I am prepared to learn as much as I can from anyone, so I read on.