A lot of OP's in AIBU seem to fall into the same category as this one.
I think polishing your halo here by telling an acquaintance how morally inferior to you they are will have predictable results with each audience.
I'm reminded of the movie "Blast from the past" where Brendan Fraser's character emerges from decades spent in a nuclear shelter, and his impeccable 1950's manners meet modern youth, who are genuinely nonplussed to discover that the purpose of good manners is not to enable you to look down your nose at other people.
Alicia Silverstone as Eve discussing him with her brother:-
Eve: Now hold on, hold on just a minute! In the first place I do not fall in love with weirdos who I've only known for four or five days!
Troy: Yes you do.
Eve: And I don't fall in love with grown men who collect baseball cards!
Troy: Yes you do.
Eve: Or pee in their pants when they see the ocean!
Troy: Yes you do.
Eve: Or have perfect table manners!
Troy: You know, I asked him about that. He said, good manners are just a way of showing other people we have respect for them. See, I didn't know that, I thought it was just a way of acting all superior. Oh and you know what else he told me?
Eve: What?
Troy: He thinks I'm a gentleman and you're a lady.
Eve: [disgusted] Well, consider the source! I don't even know what a lady is.
Troy: I know, I mean I thought a "gentleman" was somebody that owned horses. But it turns out, his short and simple definition of a lady or a gentleman is, someone who always tries to make sure the people around him or her are as comfortable as possible.
Eve: Where do you think he got all that information?
Troy: From the oddest place - his parents. I mean, I don't think I got that memo from mine.