[DiogenesKynikos]

It's not really ambiguous at all, unless one is being pedantic. "I like the Brits because of their eccentricity" is perfectly normal English, referring to their overall quality of being eccentric.

[adammarples]

If you like us for our eccentricity, you'll love us for our pedantry

[whycome]

The sentence before it with “an”

[DiogenesKynikos]

You can technically read it that way, but that's not how I think most native speakers would read it.