Well, cute and persistent.

Really, it's just a matter stating your opinions as just that. Everyone is entitled to their own opinion. I had a friend who was always very critical of movies and if he saw a movie he didn't like he would say "that movie sucked". It wasn't that he just didn't like the movie, in his eyes the movie was bad and you had no business liking it if he didn't. He was one of my closest friends but after a while I simply would not discuss movies with him. In fact, the running joke was that people would mention a movie around him and one of us would take on his voice and mannerisms and say "sure, that's a good movie... if you're STUPID". LOL!

I usually try to temper my comments with a statment that goes something like "I don't agree with that and it wouldn't be for me". But I would never say that something was wrong or that nobody should do something if I didn't want to do it. I have a friend who jumps out of planes. I wouldn't jump out of a plane. But far be it from me to say that people who jump out of planes are crazy or stupid. I simply say, "I would never do that".