I know this goes without saying here.... But I've been wanting to rant about this for a while.
It's a common "complaint" about how will they explain to their kids when they see two men together or two women together. And just today I saw a video about a pastor? I believe, who was complaining about Lego store workers wearing a rainbow pin.
Firstly depending on the age, a lot of kids do not have the connotation that rainbows are associated with LGBT.
Secondly, kids do not contextualize relationships based on sex. They don't see two gay guys in public and think "how does that work with two penises?" They have absolutely no context to question any of it.