Home Tournament Poker Etiquette

Two days ago a friend invited me to a home NLHE tournament that was being hosted by a friend's friend of his, thus making me an extreme outsider. At the tournament, I found players violating NUMEROUS rules (not re-raising at least the amount of the original raise, string betting, showing other players cards, etc.). It was far out of the norm that I was used to, but I felt out of place making comments since I only knew one person there out of approximately 10-15 people. Would I be out of place to comment on any of these rule violations, or should I just let them slide as nobody else seems to be bothered by them? The plus side to them not knowing any of the rules is that most of them are extremely loose and poor players. I feel that if I commented about the rules, players would tighten up and possibly play stronger. I pocketed $160 from a $20 buy-in, so this weak play is definitely welcome, haha. I just would like some feedback. Thanks.