Whoever wrote that the attitude will get better as you get higher and you will get better players and see less losses.
Im very very sorry to burst your bubble but sadly people utilizing profanity and being annoyed as well as really getting into the game and blaming their teammates is part of a competitive community.
Just take a look at league of legends just to mention the one most ppl tend to think is the most toxic community out there. Doesnt matter what rank you are at. there will be someone whos so frustrated about not being able to progress being stuck where he is or just generally getting a guy whom does not play the way he wants to so he starts getting verbal about it.
This game wont be much different. You cant get rid of that mentality and once real prizes and rewards for progression shows up the mentality will get worse cause everyone wants to get their share of loot and believe they are worthy of it but the rest of you on his team is simply in his way for his quest to glory.
Ranked games are generally not super fun in most games. They are there to be serious and make a display of how good you are as well as get you some sorta reward if you really are good enough (which 99% of the online community think they are :p). Can just hope human mentality will change sometime so ranked will actually be really fun in any game but thats a small hope lol.