My first tech game was in '99 and after they beat us, I was walking back to my car with my future wife, her parents and my parents. A truck full of guys pulled up and threw a couple of beer bottles at me and yelled a few colorful metaphors with some racial slurs and drove off. This has always left a bad taste in my mouth.
My most recent game, I attended '05 game and I sat with my father in law and he has season tickets. The alumni weren't no where near as ****ty as the students. There were a few that talked to me and wished our team luck the rest of the season after we got our asses handed to us again. When we were walking out, there was one gentleman who got in my face about getting our asses kicked, but I just walked out...since I was outnumbered.
I recently moved to Lubbock and this past season, I went to 2 tech games with my father in law since he had no one to go with and I wasn't headed to College Station. Again, most of the alumni were polite, but I didn't wear any of my A&M gear. Maybe one or two guys made a reference to A&M becuase tech wasn't playing up to their potential.
I work in a company full of tech grads. I think that less then 5% actually graduated from another school. I got my ribbing of course during the football season, but there are only 5 coworkers that like to rub it in a little. The rest are really cool about it unless they come back from 27 down in basketball to win...then they bring it up.
So with all this, like everywhere else, you have your bad apples. Tech might have more than others, but they do have some great people. I work with many of them. Just try and stay away from the students and the mob mentality and hopefully you won't get a beer bottle whizzing by your head.