My mother-in-law always used to get annoyed at me for using my knife and fork in the European manor instead of the American way. She said it was boorish. I don't know anybody else here in the US who cares in the least which way you use your knife and fork, so I always interpreted it left over behavior from her upper class DC upbringing in the 1930-40's.

(I did try to explain to her that it was more related to my being left handed than my attempting to emulate European behavior. It didn't seem to make much difference to her.)