I'd assume it will be about the same amount of problem as it is in the US or wherever else you're from. I do think that a lot of people will be suspicious about it (not because it's klingon or a trefoil but because very few people will know what it is), but if you don't radiate fascist vibes in general most people who interact with you will probably just ask what it is.
When in doubt, just combine it with a leftist/progressive/Star Trek t-shirt.

