To be proud is a good thing. It’s showing that you care and that you are confident in what you’re doing.
To be that arrogant, however, has no purpose to it and there’s no benefit to anyone. A person must strive and toil strenuously with patience and friendliness and you can prevail in all things. With a denigrative attitude towards others and inflating your own importance, you lose everything. There’s nothing left for you.