AIAI? Wrting Advice Edition

[Asking because I really don't know. Only the usernames have been changed. After this, the conversation moved onto befriending fellow ex-wives of the same man.]

Person 1: I'm trying to finish this chapter. It was done, and then it wasn't, so now I'm adding another scene...
which will suck.

Person 2: it will not

Person 3: But the spirit of the whole thing, that I love. The crazier the better

Person 2: Yes it will NOT suck

Person 4: It will not suck
We hath spoken.

Me: Yeah, it probably will.
Most first drafts do.
And then you'll put in the work to un-suck it.
De-suck it?
What's the proper conjugation here?

Person 2: [Hannah], no.
As previously discussed, telling people their work will suck is not the encouragement you think it is.

Me to Person 2: I'm thinking of every piece of practical writing advice I've gotten from people who do it for a living, and the advice of "the first draft won't be perfect" is high up there. Right up there with "don't be discouraged by frustrating initial efforts."

Person 2 to me: Yes, and I understand that. But how you say it is not this. And we've asked you to stop.

Me to Person 2: To be clear for the future, had I said, "Whatever you write, I'm sure be able to turn it into something astonishing", would that have been okay?

Person 2: yes

[In retrospect, the "it will suck" could have been in reference to the unpleasantness often associated with new, fresh composition to work already thought complete. But as no one else in the group took it in such a way, it didn't hit me to do so as well. So, AITA here?]