Does this apply to all non professional players and never apply to professionals?There are issues I've noticed over the years when playing with others in band or jam situations. Here's a list of things that sadly a lot of players don't understand. There is some overlap between them. This is just a get-it-off-my-chest rant. Feel free to add your own pet peeves!
LISTEN TO THE OTHER PLAYERS: So many musicians are in their own world. They play stuff that doesn't fit into the context of the music.
WATCH WHAT'S GOING ON: Don't stare at your fingers or feet, a bandmate may be trying to get your attention.
IT'S ALL ABOUT THE SONG: What you play should serve the music, not show off your chops. Play what fits.
YOU ARE A TEAM PLAYER: Playing in a group is different from playing solo. e.g. Attention keyboardists! Ease up on that left hand!
LOUD DOES NOT EQUAL GOOD: It equals hearing damage.
DON'T BE AFRAID TO PLAY SOMETHING SIMPLE: This is great advice I got years ago. I often read about drummers who can't play a fill without losing the beat and throwing off the rest of the band. Leave out the fill and focus on a simple steady beat.
There, I feel better already!
Seems this has been framed in way that is a tad elitist as opposed to being a helpful to those that may need to hear it or as a rant specifically framed against your lived experiences of the people who have exhibited this, I 100% agree with every point you made btw and I would and have called out bands members for all of the above in my Amateur bass playing career. I ain't the greatest bass player but poopie has always been together when needed.
I totally agree, my beef is with players who never learn and remain amateur.
I assume you mean amateurish as opposed to amateur as being paid for something is no indication of your ability to learn and develop and as has been mentioned, some pros will also need to learn the above.
Give advice, help those that need it, call out those that don't learn and are disruptive, but don't lump everyone into one category.
But I will add:
PUNCTUALITY: If a rehearsal starts at 1900, be ready and waiting to get into the rehearsal space bang on time and get yourself set up and ready to play asap. If you want to chat about what you did last night then there is plenty of time once you've loaded the car up to head back.
NARCOTICS: same sentiment as above, have you poison after the rehearsal.
The first band I was in after my "bass playing" lay off, suffered strongly from the above and as well several from your original post.

