What should I say to apologize to someone for being rude to them?
user
There are many useful strategies you can use to apologize for being rude or hurtful to someone, and it may be helpful to tailor your approach to the specific context and people involved.  However, good general guidelines for an effective apology include demonstrating sincere regret for your harmful behavior, clearly recognizing and acknowledging the hurt you caused, making an effort to repair the relationship and rebuild trust, and demonstrating your commitment to avoid such hurtful behavior in the future.  You can also seek to understand the impact of your behavior on the other person, showing empathy for their perspective and feelings.  Finally, an effective apology acknowledges accountability for your own actions, and makes no excuses or justifications for your harmful behavior.
assistant
What should I say to apologize to someone for being rude to them?
user
That is a really tricky issue, since there is no one correct response to offer, and every relationship is unique.  However there are a few common patterns which often work well.  Here are some things you might try:  

-  “I am sorry for my recent rude behavior.  I had no right to speak to you in that manner, and I hope you can forgive me.”  This expresses regret for your actions, and emphasizes your sincere apology.
-  “I apologize for my recent rude behavior.  I should have been more patient and respectful towards you, and I accept responsibility for my actions.”  This focuses more on the specific actions you took, and how these were inappropriate and harmful to the relationship.  It also makes it clear that you “own” your actions and accept responsibility for them.
-  “I realize I was rude to you the other day, and I really appreciate your patience and understanding.  I will do my best to be more respectful in the future.”  This acknowledges and apologizes for the specific incident of rudeness, states your appreciation for the other person’s forgiveness and patience, and commits to being more considerate in the future.  

I hope these suggestions are helpful to you!  Best of luck in your dialog with your acquaintance, and I hope the two of you can heal any hurt feelings and build a stronger relationship.
assistant
What should I say to apologize to someone for being rude to them?