Which emphasizes further the issues with generalizations and assuming that every diver of X agency is the same as the ones you potentially met. I haven't seen this mindset being applied in other agencies.
I had the chance to dive in Greece, North Italy, and Norway. Even before getting into GUE, the gear I was diving in from my first class, were easily identifiable as GUE compliant to say the least... In all these places I have been in mixed dives with GUE divers and others, and in most cases alone with non-GUE insta-buddies. I personally, never saw any kind of harsh comments or attitude from GUE divers towards others. Not in front of them, not behind their back. The only toxic attitude I experienced (even before I joined GUE) was from non-GUE dive professionals towards myself when they saw my gear. And I mean pathetic, passive aggressive comments, or even trying to debate me... like I cared. The attitude was extremely defensive just on my presence and when we got in the water, the reasons were obvious for most of them. I have never got hate from just regular divers.
This might be a reaction to *ssh*le GUE divers that I have yet to meet... Sure. But something they don't realize, similarly to some people here, is that the toxic attitude of a possible minority in GUE is not part of the GUE standards, and that in contrast to popular views we are not a hive mind collective.
I don't feel the need to accuse or expect apologies from every PADI, IANTD, SSI, etc instructor I meet for the toxic behavior from others in the past, but somehow some people are feeling the need to do it with GUE, and even with brand new GUE divers.
P/S: I had the luck to meet GUE-Is from Greece, Germany, Italy, and there were some of the most wholesome, cool, and chill dudes I have met. It's hard to believe that they propagate or even allow their students to being toxic toward other divers. The ones who potentially do, I would bet that is a small minority.