Why are people rude to newbies in solo ranked?

So, is there any particular reason people have to be complete A-holes to someone who is new to ranked? I played enough to get ranked last season with friends, so pick order never came up, and as such I didn't even know it was a thing. I decided to solo this season's provisionals, so it was the first time I ever encountered pick order. Anyway, I got in, said "top pls" and waited for my turn to pick. Well I guess the guy in lead banned a jungler that ours wanted to use, so he went top instead. Confused, I asked why he did that and he said it was pick order. Even more confused, I asked what it was and he said "shut the f*** up and to take whatever is left". Yes, I acted in poor taste and quit the game out of anger, but that doesn't negate the fact that if he had just explained it to me, I would have been willing to go mid or even support. I kind of figured out what pick order was during that whole trade, but I still went and looked it up just to make sure I understood it. His actions seriously made me consider never trying ranked again. I don't know about anyone else, but I tend to not like playing with people who curse at me for being new to something.

I would like to thank most of the people who commented for proving my original point, albeit indirectly, that people are rude asshats.