The most toxic I've ever seen people in this game is over that stupid Tri-boost. And like... I get it. It's really nice to have that 40% extra exp and rare drop. But throwing a childish fit over no party or incomplete party or people who don't want to party gets you nowhere, and doesn't make anyone want to party with you more.
I noticed that they became more aggressive on this particular thing, with related symbol arts spammed in area chat over and over, taunts and insults to people not joining a party, party invite spams with subsequent flames.
Imho that's on sega as they should've foreseen that running around a map for days/weeks/months with abysmal drop rates eventually leads to frustration and people would become toxic if they feel deprived of a tiny bit of RDR.
On the other side, the AFK it's only on the players as they willfully choose to do nothing and get loot/xp (altho I don't understand afking for xp since we got enough keys to level most, if not all, classes to 90).