وَلَا تُصَعِّرْ خَدَّكَ لِلنَّاسِ وَلَا تَمْشِ فِى ٱلْأَرْضِ مَرَحًا ۖ إِنَّ ٱللَّهَ لَا يُحِبُّ كُلَّ مُخْتَالٍۢ فَخُورٍۢ ﴿١٨﴾
你不要为藐视众人而转脸，不要洋洋得意地在大地上行走。真主确是不喜爱一切傲慢者、矜夸才的。
Haram Speech & character
Is pride and arrogance haram?
Short answer
Yes. Allah does not love every arrogant boaster (31:18), and tells us not to walk proudly on the earth (17:37). Pride is rejecting the truth and looking down on people. Humility is the way of the believers.
Evidence
Quran
وَلَا تَمْشِ فِى ٱلْأَرْضِ مَرَحًا ۖ إِنَّكَ لَن تَخْرِقَ ٱلْأَرْضَ وَلَن تَبْلُغَ ٱلْجِبَالَ طُولًۭا ﴿٣٧﴾
你不要骄傲自满地在大地上行走，你绝不能把大地踏穿，绝不能与山比高。
This is general information, not a fatwa. For your own situation, ask a qualified scholar.
Questions about halal and haram
Is pride and arrogance haram?
Yes. Allah does not love every arrogant boaster (31:18), and tells us not to walk proudly on the earth (17:37). Pride is rejecting the truth and looking down on people. Humility is the way of the believers.