I think you may be viewing my thoughts through an uncharitable lens. I am not bothered at all when anyone celebrates any aspect of their identity.
I'm a white Australian; my ancestors committed atrocities, yet, I do not feel shame for their actions, because I wasn't involved. I can only take shame in how I have acted.
To reiterate, the definition of pride is localised to the individual. It doesn't make sense to be proud of someone else's accomplishments if you haven't helped them.
A parent may feel proud if their child has done well, they have contributed to their success. However, if my college in a different department gets a promotion, I shouldn't.
Now extend this to people you don't know, and it makes no sense at all.
This has always bugged me. It's strange how labeling someone as "racist" actually works in the racists favour; you're partially validating their point by implying there's a greater biological gap than actually exists.
Bigot works well as a replacement if this bugs you, and it's probably more accurate, people with "racist" views are more likely to be homophobic too.