They say "Easter worshipper" because it sounds like "Ishtar worshipper." Many of these people are in mystery schools, like Skull & Bones, high level Freemasonry, and other strange cults that worship the old pagan gods:

This rediscovered name for God is revealed as 'JAH BUL ON' It is regarded by Royal Arch Masons as too holy to be uttered by one person, therefore it needs three masons to utter one syllable each.

Masonic writers agree that this is a composite of three gods. JAH for Yahweh. BUL for Baal. ON for Osiris.

https://www.yorkriteofcalifornia.org/royalarch/ra_education/Holy%20Royal%20Arch%20-%20Jabelon.pdf

That's not what we mean when we talk about Easter. We are talking about Jesus Christ dying for our sins so that humanity can be saved by grace. They want to mock that message, because they hate Christianity.