Back in the 1.0 days we had to band together to fight the game's design. We didn't have time to bicker with each other.
Real talk though, as far as MMOs go FFXIV has always had a better reputation community wise when compared to others (WoW, GWs, ect) As someone who has been playing WoW and FFXIV since their respective launches I can attest that I noticed WoW's toxicity much faster than FFXIV's. This can be blamed on a number of reasons, the biggest being popularity and WoW running for years before FFXIV 1.0 launched. The memes of WoW refugees however tiresome they are still have a moniker of truth in them. Since the launch of Battle For Azeroth (Some will argue since WotLK) Wow has been going through some rough changes that have not set well with their audience. You take those people who were already dealing with WoW's LFR/LFG ontop of frustrating game design choices that then come to FFXIV for something new and the Duty Finder becomes just another home for that toxic behavior.
Any kind of random matchmaking dungeon / raid system in any MMO is always bound to be toxic eventually. FFXIV imo took longer to get to noticably consistent toxicity but even then I usually have more good and neutral experiences than bad ones. This being said just because I don't personally experience it does not mean it's not present. FFXIV has been having it's own brand of toxic behavior as early as discussions about Legacy Players back in 2.0. We've seen the topic of hate and outrage change from Patch to Patch. In the end negativity will never be gone, especially in this current era of Out Rage Culture that is so popular today.
All We can do is have some self accountability for our actions. Where it would be easy to just baby rage or be sarcastic / petty, instead try to engage with positive input and feedback. This community reflects what we put into it.