Friends hi-fi system not very good, what do you do or say?

Don't be D, we have enough narcissistic ego babies in this world. Ask them about their system. Engage with them how they put it together and what was most important to them in sound. Maybe they had financial limitations, or maybe they like detailed and you like distortion or vice versa and to them yours sounds like crap or you reveal to your friend you don't make good decisions with money. See where this could be going? So be engaging, listen and appreciate your friends system. I mean if your friend wasn't as good as you at something would you tell him he's not any good bcs he doesn't live up to your standard? However if you mean this from a place of genuine narcissism and you just can't get out of your own way, then invite him to go check out a system at some audio store and let him hear some different peaces of equipment. First it would be fun and it saves the friendship from any kind of resentment due to your personal needs of everyone having to know your opinion that's not all that important in the end. Just saying....

@daniel25 

Very insightful.  It's all about the ego isn't it. People love to put other people down it's resisting this temptation that proves most challenging. We as humans tend to be very judgmental about what people do …

If someone 45 years ago bought a Pinto or something else equally disturbing, it would be very troubling.  

Every few days I see a Tesla cyber truck parked in front of my house and it's really cool looking and there's only about 3000 of them that were made. I don't know if this is a DeLorean experience being repeated but they are super cool to look at 

And lest we forget, "No good deed goes unpunished."  Attributed to the Bible and other sources.

I usually either find "better friends" or bring a bottle of tequila to inhance the listening experience. 

The other option is to tell him he needs a sub woofer....everyone can relate to that.