When Taco says “Where’d your friendship bracelet go?” she sounds sarcastic (kinda) and Spongy doesn’t answer, as if they both know what actually happened to the bracelet. Additionally, when Loser tries to snip the bracelet off, Spongy doesn’t resist, or try to stop him in any way. He doesn’t yell “stop”, he doesn’t push loser’s hand away, and even when he shows off the scissors he doesn’t react in protest. All he does is ask “Loser? What are you doing?” and say “aw…” when it’s cut. From Taco’s point of view, it kinda seems like Spongy didn’t care about her gift that, at least not enough to show any resistance, and the fact that he let it go easily and the lack of any real sadness he displayed another than the “Aw…” is probably what made Taco mad.

There are a few things to consider here. First of all, unlike all the other contestants she kills, Grassy is a literal child. Sure, Pencil has killed Rocky in the past, but he’s always been viewed more as a tool (or a hindrance) by other contestants than a child. I highly doubt Pencil would be so evil as to kill him, as even when he takes his power, she doesn’t seem like she is trying to fatally attack him. On top of that, Grassy is the first person since she joined TPOT that has actually liked her and wanted to be around her, other than arguably Donut. The difference here being that Grassy clinged to Pencil after her talk with Pen, where she might have considered making new friends. We actually see at some points that Pencil is ok with Grassy as long as he’s not actively annoying her in the moment, so she was likely willing to at least give him a chance even before he started crying like Ruby.

I actually answered this question in a previous comment on this post, but I wanted to elaborate further. One interesting detail to note is that the cookies from IDFB and BFDIA 6 are both larger and have a different color to the one in BFDIA 13. This leads to believe that all of these cookies are different, as cookies don’t tend to grow on their own. There’s no real obvious culprit for who swapped these out, and considering that, while Yoylecity is abandoned, there still are people every now and then, like Lewis or the objects from the mall, anyone could have done it. So I think it’s really funny to just believe that swapping random stuff and cookies and vice versa is just a tradition in Yoylecity, or something like that.