All teams, yes even the Yankees, have these types in their stands too.
The MVP chant is just showing admiration and good vision of things to come. It's a continuation from last year. I can't think of a better compliment from a thousand feet away. You're off base on that one.
Booing Beltran well may be fun for some of the ignorant fans but it is mostly just pent up frustration. The guy needs to earn his money. I would think you would have to agree. Some take it way too far I will admit.
It does sound like you are talking about 10 people out of the few hundred in your listening range. The phrase A few bad apples spoil the bunch has been taken to the extreme.