"Bitch Shield" is a tactic for quickly filtering potential mates via subjecting them to stimulus that quickly discourages socially weak candidates. One could call it an immoral tactic, but there doesn't seem like much point to such labeling.

I was referring to the idea that one should try to "get past" the "bitch shield" as immoral, because it is essentially an excuse for bothering people who don't want to be bothered. I wasn't referring to the "bitch shield" itself.

"the type of woman you'd be interested in" outright rejects any male she sees competing socially with other males then "wouldn't work on her" just doesn't make any sense

Why not? It's really not fun to be around people who view social interactions as a competition.

Also, "competing socially" really softens the antagonistic behavior advocated in the forum.

to remove a potential male competitor—through physical, verbal, or psychological tactics

What, you wouldn't reject someone who tried to pull that?