As Günter Bechly puts it:
I have been introducing the subject of a mystery that bothered Charles Darwin himself (see here). The abrupt origin of flowering plants is by no means an exception to the rule. Instead, it is representative of a general pattern in the history of life and the fossil record. In all groups of organisms, in all regions of the Earth, and over all periods of Earth history, new groups and new body plans appear abruptly in the fossil record, mostly without any potential precursors in the older layers (Bechly & Meyer 2017).
Günter Bechly, “Darwin’s “Abominable Mystery” Is Not Alone: Gaps Everywhere!” at Evolution News and Science Today (June 12, 2021)
People who don’t like hearing about that so often resort to abuse because it’s like mentioning that the elephant in the room is not a stuffed toy.