"aw, isn't it cute this is her boyfriend/his girlfriend" way, or talk about Johnny flirting with the girls etc.
I've never experienced this before a child could talk, it's weird to sexualize any child this way i stand by that.
I'm not blind enough to close my eyes to it though and pretend it doesn't exist.
Nobody has said it doesn't exist, it clearly does however same sex relationships are also not exactly hidden away, there's a long way to go but we are at a point where they are seen as normal and they are starting to be represented as such.
This is of course only in my experience as i can't talk for anyone else.