I have had equally receptive audiences in the US and the UK, and equally hostile reactions in both contexts. There are people who enjoy magic for magic's sake and those who simply do not want to suspend disbelief and they tend to feel threatened by a magic performance.
I had a residency at a club locally here and I found that the male customers were threatened by tha fact that the women were being entertained. I actually got confronted and was told to leave after doing car warp to woman in the bar!
I remember another gig at the London Arena and I was doing some stand-up magic for a group of women and after one effect, I noticed the men quicky gravitating back to join their partners. Lots of primordial herd mentality
The pub culture here is a great friend of close-up magic. I have done both walk around and stand up performance in function rooms, and both formats are great for the kind of stuff I like doing.
Now, I like the after dinner format. People are fed and lubricated (not too much mind you) and ready to be entertained. I am doing a charity event in December where people are choosing to come see the performance, which is wonderful.
As for Japan, I had a nice experience in Fukuoka earlier this year. I was in a wonderful San Francisco-style bar (with evry kind of single mat whiskey imaginable) and started doing impromptu stuff with jiggers and napkins, some coins, and billets, all done with a fair bit of a language barrier, and the reaction was wonderful. I had been teaching the bartender some English slang, and after a did a mind reading bit, he said 'Phwoar!', which I have to say he learned rather quickly.
I think it is really hard to generalise about national reactions to magic. I have performed in Brazil, Kenya, Mongolia, and across the European continent for various audiences (the Dutch are very keen). I teach students from over 100 countries at my University, and I have not noticed different reactions by nationality.
Usually, things are fine, but you will normally find different levels of 'heat' from different people. Fay Presto gave a nice lecture for our magical society and was getting heat from one punter for most of her show, but she then did a card effect and he finally rolled over. She actually spent most of her set trying to win him over and then he cracked.
There are many views on this:
(1) Ignore the heckler/sceptic
(2) Engage with them and try to win them over
(3) Challenge them and embarass them in some way.
I have seen different magicians take different approaches. My approach is normally to engage them. Ask them to help out with something. Let them shuffle some cards or write something down on a billet. Get them involved and give them ownership. If they still do not want to cooperate, I ignore them as the audience is not interested in them either. The group dynamic usually takes over and self censorship sets in.