When you meet someone who doesn't take you seriously, here are some things to consider:
Stay calm: Don't let the disrespect and indifference of others affect your emotions. Stay calm and sensible, and don't let their attitude easily affect your own self-esteem and emotional state.
Maintain your dignity: Maintain your dignity no matter how the other person treats you. Don't lower your standards or succumb to disrespectful and unfair treatment. Stick to your principles and values.
Stay away from negative influences: If you notice that someone is persistently disrespecting you, whether in words or deeds, it's best to consider keeping your distance from them. Don't let such people continue to have a negative impact on you.
Seek support: Tell friends and family about your feelings and ask them for support and encouragement. They can give you advice and emotional support to help you deal with this dilemma.
Maintain objective and rational interactions with them: If it is necessary to continue interacting with the person (e.g. in a work environment), try to maintain an objective and rational attitude. Don't let personal emotions or anger cloud your judgment and actions.
Most importantly, don't change your values and code of conduct for the sake of disrespect from others. Stick to your principles, seek positive solutions, and focus on your own growth and well-being.