I know being hostile to new users is not ok.

But have you seen the shit new users post? Who wants to be part of a community of simple minded and unexperienced idiots?

New users do it all: awful english, strawman, meme reposts, and now, advertising.

I wished there was a "above certain karma" filter, so I could avoid the trash.

But there's not, so the only tool I have is telling them their arguments are stupid.

I don't mind someone BEING a beginner. But as such I would expect them stfu a bit.