If I, or someone else on my card, says "Hey, I'd prefer you not comment on my shots" and they are continuing to do so, yeah, I'd stroke them. Especially if I saw the card mate clearly trying to ignore them or block them out. Most especially if the comments, like OP mentioned, are comments saying something about future game play.
The proverbial $20 Nassau, or whatever the disc golf equivalent is? Yeah, that's just part of the game. In a tournament round, nope. If someone on my card doesn't want other people commenting on their shots, it is not courteous to continue to do so. That's seems to me to be the intent of the rule. Don't be a jerk to other people, whether it's card mates, other competitors, spotters, officials, TDs, whoever.
Conversely, if I like having people buck me up, but you don't feel like it, that's on me. I have no right to expect you to do so. This is a game where people are expected to respect each other and allows for comradery. Alden Harris wants to ask Gannon Buhr "Can (should) I jump putt this?" when they are within a stroke of each other on the final hole? That's no issue. If I'd prefer people allow me to keep my DG to myself, that too. People lift each other up at best, stay out of their way at worst.