Came to this thread late, so I'll possibly repeat some things posted in the 11 pages -- I'll look back later.
I can't speak for everyone. I feel like I have some definite B1G-hate, but I'm also among ISU fans who would've loved to join the damn conference (if an invite were even realistic) during the near-implosion of the XII. Main reason for that, though, is long-term stability.
"Hate" issues I might have, one is probably ISU-fan bias, the other personally situational:
1. I still connect ISU with the identity of the old Big 8,which is quickly becoming an obsolete assessment. In that respect, I think Big Ten gets more respect in what seem like equal situations. Hard to explain what I mean, but I'll use the '11 FB season as an example. When Big Ten was close to round-robin (and non-divisional), we saw a few seasons with a lot of teams in the mid-range knocking each other off, several teams between 3-5 & 5-3. It was seen as strength-through-parity. With Big 12 in a round-robin this season, it was similar, but I rarely heard how "competitive" the conference was. It was just a bunch of mediocre teams.
2. I have lived almost my entire post-college life in Big Ten regions (Mpls, Madison, Michigan/Indiana). Until recent years, with far more choices for out-of-area sports coverage (Fox & ESPN3, for example) that meant I was inundated with Big Ten. I still find it hard to watch a Big Ten football game, regardless of the matchup.
In all honesty, I probably have more hate about Big East and ACC basketball, and SEC football.
I admit a conference inferiority complex with a lot of this. For example, I loathe the ease with which Big Ten & Big East frequently get NCAA tournament bids for more than half its teams — but historically, Big 8/12/10 has been unimpressive as far as tournament performance (except for KU, and even then, the Jayhawks are notorious for those 1-8/1-9 second-round stumbles).