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I think that baseball players are often the most narrowminded professional athletes. Most of them have only high school educations and were raised and/or reside in parts of the country that are generally more conservative and less welcoming to lifestyles and that are considered nontraditional.
Ah, the myth of the baseball player as corn-fed midwestern farm boy. Just as a reality check, I pulled up the birthplaces and colleges of the ten highest value fantasy players (using Sagarin's rankings) who were American born. The results
11 of 20 were from metropolitan areas on the East Coast, West Coast or Great Lakes (Alex Rodriguez, Jeter, Jason Giambi, Randy Winn, Garciaparra, Bonds, Brian Giles, Kent, Aaron Boone, Derrek Lee, Shawn Green)--mostly southern California.
Only 6 of 20 were from smaller communities in the South, Great Plains or Rocky Mountain States (Johnny Damon, Torii Hunter, Mike Cameron, Lance Berkman, Pat Burrell, Chipper Jones)
3 of 20 were either from large communities in the south (Helton-Knoxville, Ray Durham-Charlotte) or a smaller community in a less conservative area (Thome-Peoria).
10 of 20 also had at least some college (Giambi, Thome, Winn, Garciaparra, Bonds, Berkman, Helton, Kent, Boone, and Burrell). Obviously, to do this properly, you'd have to go through all the rosters, but I don't think your characterization of typical baseball player backgrounds is accurate.
So I don't think baseball players are necessarily more conservative on gay issues. Comparing the comments made around the Billy Bean and Piazza stories to those surrounding Tuaolo in the NFL, I think MLB is probably less hostile than the NFL. Certainly, I don't recall anyone in the NFL being as welcoming as Bobby Valentine or Jeff Bagwell (who said that if a teammate were to come out, he would back him 100%). Timlin observed that he had had a gay teammate that he knew about, and it had not been a problem for him; I don't recall anyone in football saying anything like that. It's easy to say they were just being P.C., but I think they went well beyond what they needed to for P.R. purposes.
Back to the subject of Kent: I actually don't care about the choice of word (he could, if his intent was to be abusive, used fag), I just would have been irritated by the joke because it implies that gays in the clubhouse would be busily ogling all the men. That's the biggest objection raised to gays in team sports, so Kent was--intentionally or not--indirectly validating that viewpoint. In reality, a gay teammate would be used to it and would probably go out of his way to avoid looking, and I would HOPE that a gay sportswriter would maintain some professional decorum.