What seems to be missing here is that Barnes, in 20 years, did what the Texas program did in 60 years. If their expectations are so warped, that they expected him to not just be their best coach, to not just have the most success, but to far eclipse what they ever accomplished, they're just a bunch of drooling lunatics.
The only reason they had any reasons for high expectations was solely because of what Barnes himself accomplished. They are not a basketball power, they never have been, but Barnes gave their program unprecedented success, and they got it into their silly little heads that somehow that was a failure on his part.