How to annoy composers:

Tell them their work is "interesting."

Tell them you like their work, but it doesn't suit your present needs.

Tell them you don't know much about music, but you know what you like.

Ask them what their music "means".

Tell them that 20th Century music is too complicated.

Tell them that 20th Century music is too cerebral and lacks emotion and feeling.

Tell them that you love modern music. After all, you have every album the Carpenters made.

Tell them to be grateful for their "gift" and "talent". [This will invariably imply that they never needed to study, practice and learn, or really do any work at all.]

Tell them you'd like to honor them by playing their music, but you shouldn't have to pay for it. After all, ART belongs to the world.

How to annoy theorists:

Tell them that music is an ART and can't be the least bit objectified or abstracted into a scholarly endeavor.

Tell them that science and math have absolutely nothing to do with music.