In the concert wind band at my school, the conductor (who plays piano and everything woodwind-y) continually ignores the bassoons and oboes, picks on the flutes and clarinets for not tonguing properly, then yells at the saxes - but that's probably because they're just both very annoying boys.

He is always nice to the tubas - I think that's because there used to only be one, and he didn't want to scare him off. Now it's become a habit!!

He does not differentiate between cornets and trumpets, calls the smallest trombone player 'Squirt' and is nice to the euphonium player because she's the Head of Music. Anyone else gets ignored like the bassoons do.
(He's my bassoon teacher.

Luckily I play clarinet in that wind band!)
Youth Orchestra (in which I play bassoon, or try to anyway):
Bassoonists - we sit at the back poking the oboists with our instruments, telling jokes and stealing each other's reeds.

Childish, I know...
Oboists sit there (a) getting very annoyed with the bassoonists, and (b) showing off that they can play the long, fast runs. I have to admit that they are both extremely talented musicians, though.
Brass - there's only 3 of them so, together with the
clarinets, they are generally quiet and sensible.
Percussion are normally found hiding behind a corner for a chat or a snack, though when they do play, they're very good.
There are at least 5
flutes, who spend most of their time arguing with the conductor or laughing.
Finally, the
strings pay attention and work hard - well, there are only about 8 violins and at least 10 cellos, so it's not very balanced!
Anyone in the Cambridge area who plays brass, violin or viola to about G5-6 standard and is interesting in coming, you're very welcome to just turn up - PM for details. No flautists or cellists need apply!!

Nothing personal, you understand...