You are right, attitude towards newbies are negative here. But there are many reasons why. Newbies asking same general questions which was already asked million times. These users should put only minimal effort to find the answer, it's not that hard. For that purpose we have sticked topics with general information that they need to know. If they didn't found answer, it's nothing wrong to ask here. And more experienced members are getting tired to see and answer same questions. You are saying that some people are lazy by nature, but it's their own problem.
But I'm seeing harsh attitude towards newbies not only here on Bitcointalk, but pretty much everywhere where we can find discussions about crypto. Newbies asking same questions like "How to buy BTC with USD", "Which exchange, wallet to use", "how long verification takes" and etc.
It's fine if newbies ask same questions over and over again. What I think is that more senior members can either ignore them and don't answer. This way they have to dig up themselves. If they continue the same question over and over again opening a thread for it, they can be reported to moderator. But what I think is there is no need to show any hostility towards anyone even if it's new member. Remember even the seniors were new at some point. The members are senior here not only because they've got a account here before anyone else but for they possess some good skills which they can utilise in helping others instead of showing hostility towards anyone.