I think the actual biggest problem with "Redditization" is not hostility, but instead the fact that there is really no dialogue. There's no back and forth discussion, at least not with the same actual individual. You post a comment and (maybe but usually not) get a reply, then if you reply to that reply, the next reply in thread will be from someone else. Very very rarely do you go back and forth with one person. And regardless, you'll never ever interact with that person again (except maybe if you're on a tiny sub).
It's such a odd and distorted version of conversation. I'm not talking to any specific "you" -- I'm submitting thoughts to a "mass-you" and hoping with fingers crossed that the mass-you will reply or at least nod in approval with a single upvote.