Well, the question you asked initially was if you are toxic, and if you are telling your teammates they are incompetent and should just stop playing, then I would say yes, you are being toxic.
As for the separate issue of why they didn’t know your weapon and location before raising a wall despite being in a high rank, I don’t know. Maybe they got to asc/immo by being cracked mechanically but are lacking in game sense. Maybe they weren’t paying full attention to the situation throughout the whole map for whatever reason. Maybe they just hit the wrong key, who knows?
I guess the point is that when your teammate screws something up in the second round, instead of immediately raging and saying they’re incompetent and should uninstall, the better way to handle it would be to explain what happened and ask them to check the minimap next time before using utility. Also, while you might argue a high-rank player “should” be aware of the entire game state at all times, it’s never a bad idea to explicitly communicate your intentions and how you want your teammates to support you. If you’re going to say something, “hey, I had an outlaw mid but your wall blocked my sight line and I got killed instantly, please check the minimap next time before raising the wall” is so much more productive than “hey, you’re incompetent, please stop playing.”