I’ve recently had a newish-player (3-4 priors at my two-table home tourney) stop attending after getting very gently chided as follows:
There was a three-way all-in, preflop, 6 players left, 4 getting paid.
On the flop, the first caller checked, but the new-ish player (who covered the other two) put in an odd bet for about 3/5 of the pot.
The first guy looked annoyed and folded, and the newish player turned over top pair/middling kicker. She ended up losing the hand, meaning the short stack (TPTK) doubled up rather than getting knocked out by the folder, who had an overpair. The table groaned.
Several people tried to explain—politely, I thought—our custom of checking in that situation unless you have the nuts or very close to it... That when nearing the bubble in a tourney its usually -EV to bet in that spot without a very strong hand. The first guy folded on the assumption she had to be betting at least a flopped set. Many in our game will not bet in that situation without the absolute nuts. Tacit collusion, arguably, but pretty standard.
The new-ish gal looked perplexed, but after some discussion seemed to get it.
About 25 minutes later, this happened again with her—and people again tried to explain it. I could see she was still confused and also embarrassed, though I thought people discussed it diplomatically.
Anyway, she hasn't been back for the past few games. Could be unrelated, but I suspect she won’t be back.
I'm missing how this fits into this thread. It sounds like your group was unhappy because the new player wasn't willingly colluding...