Both Ardiis and Guild coach claim that OpTic would constantly write in all chat calling them shit and disrespecting them in scrims.
Why are NA like this?
https://www.youtube.com/watch?v=PGReugSkVnk&t=3652s
Here's the Source. He also says that he eventually had to ask them to start trying.
NA egos too big so they have to constantly prove that they are the best aka shit talk. While EU pros are more humble and don't want to burn bridges or have bad blood with anyone because that might hurt they connections and this is because EU has more nationalities, languages and cultures so it may not be as easy to rebuild those bridges and in a way you are more alone than in NA where most people know each other etc. My analysis.