The late queen was certainly offered flowers. What would you do about flowers?
Flowers given to an adult are not the same.
These three children are 7, 10, and 12. They cannot give real consent to people who touch them, want selfies, and give them gifts, because they don't fully understand all the connotations.
Until they're 15, 16, even 18, and can make their own decisions they should not be allowed to be used in this way by, what are quite frankly, weirdos after their latest royal thrill.
Luring children with gifts or shouting their names so they can paw at them and have photographs with them is not the act of any normal person with normal boundaries.
When the Queen accepted flowers did she experience what these children are experiencing? No, of course not. No one would have dared.