I think you were being ridiculous for bringing my child up in the first place.
I honestly don't care about your friend's sex lives. When I was 21 back in 2013, it would have been considered nonetheless. He'll, at school, a 16 year old classmate got ribbed for dating a 13 year old.
We need stronger protections of under 18s in the UK imo, not weaker. You're free to disagree.
And I'll continue to advocate for all children, SEN or not.