@Weeble wtf does this even mean like, pretty much everyone who i was closer to, in lovelive fandom when i was unfortunately active, was shipping anyone
As in their ships (characters they portray in a relationships) are usually problematic/unethical.
An example is shipping siblings (incest), Age-gap (This can range from pedo stuff to "they have a 3 yr gap that's fucked power dynamics"), to morally wrong (Like ppl who ship Monda Owada and Chihiro despite the former being the latter's killer)
AntiShip = Anti shipper
These are ppl who not only dislike this stuff but often argue that fans of proships and ppl who create pro-media are actively harming ppl and promoting these ideas in real life.
This as you can imagine can cause lots of drama.
There's technically the centrist pro-fiction where you have ppl who dont care or like problematic stuff but dont think its an issue.
@Weeble now this makes more sense, like, all i found on the internet is that proship means that someones is for shipping but like it didn't really stick