Based on my experiences
Iron : Bunch of newbies/unserious competitive, mostly chill vibe. When u hear someone toxic or blaming, it must be because he thinks he knew better at the game just because seen some pros/streamer play.
Bronze : Same as above
Silver : The majority of player base, so it can range from people having fun or deranked gold player thinks they're the best or smurf. Literally what you would expect from average of valorant players.
Gold : big ego few skill, just because they're better than average player, not much a toxic tho, just mute them it's not like they giving coms or something.
Plat : same as gold, just bigger ego, at least from my experienced unless we getting destroyed 0-7 or something, we won't even initiate surrender in the first place. Beware of plat reyna demon tho.
Diamond : oh boy, so one of indo val influencer once made a podcast with rank booster as them guest for the topic, and he said diamond is the most asked rank to achieved by boosting. So the skill range can vary, not to mention sometimes the e-boy dating e-girl smurf here to accompany his gf, but for the most part it's chill tho everyone knew what they're doin and if they blamin or toxic it for valid reason (not justifying it).
Ascendant : .................., bunch of people think they deserves immortal and would yell out of their lung for every clutch mistake.
Immortal : So my peak was 70 rr immo 1, and from my experience it's somehow chill, like if someone botfragging hard (<5 kill) they just told them to uninstall, or stop using boosting service, and still typing gg.
So my answer is ascendant, they played like their life on the line, if they dont make it to immortal their career would be over.