Is this even possible?
Is it arrogance in it’s grandest form to suggest that we are proud of someone else’s achievement?
What we are really saying is that we are proud to be the parent, brother, friend of someone who did this great thing.
Which is still a wonderful compliment when considered.
And is frankly more real.
Being proud of someone suggests a sort of superior position in a relationship. Being proud to be their friend, suggests an equal or superior position for them.
Having someone say they are proud of me almost diminishes the achievement to me. I REALLY hate the term.
You can be proud of yourself. Being proud of someone else is arrogance.
Next time, may I suggest you say that you are proud to be (friend, brother, parent, coworker) to that person?
That distinction makes a difference.
It's a Thought 
I never thought of it like that. Makes sense to me!
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Ohhh, mind opened. Thank you – I’m going to pay much closer attention to how I express that type of feeling. I am often telling my daughter I’m proud of her – for her abilities and strengths. I’m going to look for a different word / expression.
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It’s just another way to humblebrag.
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