A person who finds ANY ridiculous excuse to call somebody a racist or xenophobe. Typical stereotype is a white western middle class over opinionated person (but could be anyone form any background) who lacks experience being exposed different cultures other than thier own western ultra multicultural background and mis-understands people to try to describe different cultures and customs based on thier experiences unjustifiably calling them a 'racist' or 'xenophobe' based on thier own narrow-mindedness in order to satisfy their own inner demons. Even when the accused person may like or have the greatest admiration for different cultures and customs and points of view.
Basically, the analogy is based on a person who mindless walks around with both arms in-front of them groaning 'racist' or 'xenophobe' instead of 'brains' like a Zombie. Just don't let them get close to you or you may either turn into one of them or they'll eat you alive by branding you a 'racist' or 'xenophobe' and defame you in any way possible making it very difficult for the accused to remove the false societal smearing costing them thier job, friends etc. The Xenozombie will make sure you are 'destroyed' if you get close to them. Type of people who are best avoided.
e.g.1. Xenozombie: "Who you like coffee or tea?"
You: "I'll have a white coffee, please."
Xenozombie: "You Rascist! It's Milk Coffee or Coffee , no-milk!" etc.
e.g.2. You: "All Japanese people naturally have dark hair."
Xenozombie: "Why are you being so Xenophobic - Japanese people can have Blonde hair if they want - by dying in!"
You: "I did not say that the couldn't , I was merely stating a scientific fa-"
Xenozombie: "Your just racist. Trying to imply somehow Japanese people are inferior to us!"
You: "Have you been to Japan? Do you even know what Japanese people look like?"
Xenozombie: "No, but I know your a racist!" etc.
e.g. 3. You: "Darker skinned people produce less vitamin D , so are more likely to contract viruses"
XenoZombie: "Are you implying darker skinned people are inferior to us?"
You: "That's not the point I'm making. It's just advisable, from a medical perspective, for them to take more Vitamin D."
Xenozombie: "You mean them as opposed to us white skinned superiors? ... I can't believe I'm hearing this!!!"
You: "I'm just saying it's a good idea your friend takes Vitamin D supplements!"
Xenozombie: "Don't worry, I'll let my friend know what you think of darker skinned people...don't you worry about that!"
etc...