What does it take for you to block someone

I see way too many messages on this subreddit that go on far too long. If you counter my offer more than twice it’s an automatic block. if you ask me to change shipping, block. I don’t feel the need to explain myself to buyers. You’re not gonna bother me on MY phone.

I’m new-ish to selling. I notice a general hesitation to block and a very patient, forgiving demeanor with the buyer, and I wanna know the philosophy behind that, because maybe there’s something I’m missing.

Cheers