Things Iron-Clad Friends Never Do!

1. Don't show off in front of friends.
If you bought a new car, a new house, or a new partner, try to avoid boasting about it in front of your friends. You know yourself that you shouldn't flaunt your wealth online, how can you avoid it when you're with friends? Everyone will feel uncomfortable, especially your friends.

2. Don't pry into friends' private affairs.
No matter how good your relationship is, everyone has corners they don't want others to intrude upon. Respecting him is respecting your relationship.
3. Don't get involved with friends' partners.
This is a sensitive matter. Even if you can guarantee you won't cause problems, can you guarantee the other person has no 'thoughts' about you? Even if you don't have 'catty' feelings, you still need to consider your friend's feelings. Don't meddle in this kind of thing.
4. Don't let friends pay for everything (unless it's a treat).
Friends are friends. A casual meal is fine, but you should always try to pay equally. One thing should be handled one way. Even if it's a small amount, you should avoid making them feel uncomfortable.
5. Be cautious when dealing with money with friends.
Friendship becomes complicated when it involves money. If you lend money to a friend, make sure to repay it as agreed upon. If you're involved in buying or selling with a friend, you must clarify everything beforehand to avoid disputes later and prevent your friend from feeling wronged.
6. Remember to be grateful, even to iron-clad friends.
If a friend asks you for a ride, regardless of whether they're male or female, if you're alone in the car, you should sit in the passenger seat. If it's with a same-sex friend, you should proactively offer to pay 'parking fees' or similar expenses.

7. If your friend hates smoking, don't smoke in front of him.
You can tolerate smoking with your family and partner, but a friend will never be able to tolerate your bad habits. If he's already expressed his dislike of you smoking in his presence, just accept it.
8. Don't criticize your friend's partner.
Even if they're not good, it's not your place to say so. Your friend won't bring it up, so don't ever talk about it.
9. Don't use harsh language towards your friend.
Friends are friends. Don't treat them like pets or as if they're your parents'. Harsh words will hurt the relationship. It's not always about truth; they can cut you deeply and erode your feelings over time.