https://www.bbc.co.uk/news/magazine-40643461 - Beaten up for being gay.
https://www.bbc.co.uk/news/uk-england-leicestershire-19510094 - Rainbow & Dove pub attack.
It's not designed to shove peoples sexual orientation in YOUR face. It's a celebration of social acceptance of being able to be who you are, regardless of orientation. It's the opposite of shaming of which LGBT people have succumbed to for years and years. People of the LGBT community have been and still are persecuted for not having the sexual orientation people believe they should have.
I think you need sit down and think about it a bit more. Think about Alan Turing who saved millions of lives in WWII to later be imprisoned and castrated for his sexual orientation. Look how far, as a society we have came. I believe that does deserve a celebration. No one expects you to be involved, but equally no need to use the typical 'Where is my straight pride' comments. As straight people, we have had privilege's and social acceptance for history.