I don't think it is common to find memorable quotes akin to “I have no idea what XFCE is or does, sorry.” outside of this circle. This is a vintage and often quoted Red Hat-ism that betrays their mentality.
QT developers will not tell you “I have no idea what LXQt is or does.”; they do not generally break things that compromise 90% of their consumer base and they do not remove theming because they fear it's existence will hurt the “brand identity” of KDE.
It's dishonest to say similar problems occur outside of the Red Hat circle and that circle alone is commonly criticized on these policies.
If you're trying to prove a point, you could at least mention something that actually caused a real problem instead of taking this one out of context. I have no idea why anyone would keep mentioning this quote or find it memorable, it seems completely insignificant to me. You also seem to be ignoring all the positive interactions this engineer (or any other Red Hat engineer) might have had. I can personally name a lot of instances where Red Hat engineers have fixed upstream bugs that were affecting me. And just to make it clear I'm not saying this to single them out for praise, a lot of other companies fix upstream bugs too. That's how open source is supposed to work.
And you actually could go and search around on old mailing lists to find similarly questionable 11-year-old quotes from Qt developers if you really were interested in digging up more old drama. These things happen everywhere that people go because people don't agree on everything. I suspect you also think that's ultimately futile though, so why keep flogging this particular dead horse? This is still way, way outside the scope of discussion for systemd anyway.
QT developers will not tell you “I have no idea what LXQt is or does.”; they do not generally break things that compromise 90% of their consumer base and they do not remove theming because they fear it's existence will hurt the “brand identity” of KDE.
It's dishonest to say similar problems occur outside of the Red Hat circle and that circle alone is commonly criticized on these policies.