In a tournament, all players are equal. If you have $100 for the night, you get to play the same game as the guy that has $1000 for the night. That's not the same in a cash game. The player with $1000 in his pocket can make hero-calls without missing a beat, especially if he is about to make that hero-call vs a fish, where he can get his money back.
That easily can happen in tourneys if there are rebuys/re-entries (which is one reason why I don't feature rebuys in my game.)
I once played in a casino $250 buy-in tournament with unlimited re-entries. It was the casino’s first “big” tournament, and they seemed to have given incentives to various pros to attend, guys whom the new director seemed to know from a previous gig.
These pros were making a total mockery of the tournament and its stakes, boasting about how many times they had rebought, yelling to each other across the room as if it were absolutely hilarious how they were playing BINGO with us dumb, poor amateurs.
One such guy at my table claimed he had rebought 12 times, and would just keep doing so as necessary. Another had bagged a huge stack on Day 1b, after multiple rebuys, but now was back to throw around his money and see if he could bag an even bigger one. After he (and a similar buddy) busted and were sat at another table on their rebuy, the infamous Mike Dentale sat down, having also just rebought.
Having not been at the table for the past couple hours, Dentale didn't know that UTG had been playing ridiculously tight. UTG made a huge raise preflop; Dentale UTG+1 shoves with 33. Everyone folds, UTG shows KK and busts Dentale. Dentale shrugs and goes off to buy in again.
Such behavior is good for the prize pool, I guess, but in a large field tournament it gets diluted, and mainly means that the guy who showed up with one buy-in and a dream is at a huge disadvantage (and made to feel like a sucker).
Anyway: I don't think the key question is really whether the weak players are going to be bullied more or less at cash. Most likely they are.
But they also are not going to have to survive a lengthy tourney grind which will almost certainly end without them cashing. Weak players like the one described almost never get that deep in a tourney, because their lack of skill can't sustain that many tests.
But in a cash game where they shortstack for a couple hours, they actually might be in better shape if some of the higher-rolled players take loose shots at them, not really caring about the outcome. The weak player who doubles up can milk their profit a while, and leave with a modest profit at any time, or else piss it away at their leisure and get more hands in overall... Whereas in a tournament they are going to either be blinded off (because they don't manage blinds and levels well), or their poor play is going to be subjected to a lengthier test which they fail 95% of the time except for rare nights of run good.