Mandating the posting of religious based ideology on government property is Unconstitutional based on the first amendment.
There is nothing in the Constitution prohibiting the celebration of gayness at parades. There is no law mandating that you attend those parades. There is no law mandating that you fly gay pride flags at your kids school or your workplace.
Your comparison to pride month argument is completely without merit.
That said....True straight men like me aren't afraid of gay people. I am not the least bit worried about "switching sides". No matter how many gay marriages I hear about, I am not going to marry a gay person. No matter how many pride flags I see, I am not going to become gay. Same for Trump flags and becoming MAGA.
Just know....you have people like me that are not judging your fear of you becoming your true you if around gay people. You be true....You be you.