No, I can't be arsed to spend my time at the park protecting my small children from far bigger people who should not be on the same equipment.
Why should they be put at risk like that?
I have 2 children. I can't shadow them both permanently in case a grown man falls on one of them, something that could cause a significant injury to them (they, clearly, being tiny pose no risk to a grown man).
I feel exactly the same about teenagers and bigger children on equipment meant for small children.
Little kids should have the right to use play park equipment for small children without being at risk from much bigger, stronger bodies, without having to have their mother shadowing them to keep them safe rather than learning how to negotiate them independently.
If some grown ups need to use that equipment, then surely there are ways we, as a society, can arrange that without insisting that toddlers and adults share equipment when it is considered dangerous for 6 and 7 year old children to share with toddlers?
A beach is not remotely the same as a playground. But on a beach I would choose to sit well away from teenagers playing football.
I don't hate teenagers or football (except I do kind of hate football), but clearly large, almost adult bodies careering around and booting a heavy, leather sphere about, poses a risk to small children. That doesn't make it wrong, or unwelcome, just something where space needs to be made for both sets of needs.
When bigger children play football in the play park using the toddler swings as goals, I ask them to clear off if one of the DDs wants to use the swing.
I find the argument that they should play football wherever they want and I should just supervise my children more closely bizarre.