try to explain it to proud owners of "standard Australian mini labradoodle" or something like this... they claim that it's a new pure breed

If you paid $4000 for a designer pooch, you'd make that claim too. ;)

Yeah. I "manage" at work dog owners group in our collaboration system that has >500 people now. Amount of purebred doodles or poos is amazing. I wasn't even aware that those combinations are bred