I don’t find the distinction to be fuzzy at all. It’s very easy to express your opinions about things without rebuking another. Simply keep the message about you and ONLY you. People may infer from it as they please.
For instance, if someone here were to state that they see nothing wrong about attending baseball games and you were to disagree, there are two ways to indicate your difference of opinion.
1. “I dunno…I tend to steer clear of baseball games because I’m just not fond of the whole atmosphere. I know a lot of people go, but I guess everybody has their likes and dislikes.”
or
2. “OY! SHMIRAS EINAYIM! NEBACH! Don’t you know that Rabbi Zelig Ferdshmecker once gouged out his own eyes rather than LOOK at a store where they were selling baseball EQUIPMENT!!!!?? OY LANU!!!”
All I’m saying is that it is really quite possible to express one’s opinions without denouncing other people’s differing opinions. It’s the difference between expressing YOU ARE WRONG and HERE’S MY TAKE ON THINGS.