Adam and Eve, the patriarchs and Jesus were still Aryan last time I looked but they had friends of all colours and species and really clean vegetables and big too.
I’m told the give blood stickers work if you really can’t get the gumption to politely ask them to stop coming.
Seeing as the blood service are prejudiced I’m in two minds about promoting them. I’d probably veer more towards the promoting them side to be honest but anyone can have a blood disease so test the blood don’t jump to conclusions.