Just because you saw a...
... Nunu sharing his lvl 1 Golem experience with the botlane it DOES NOT mean that it's okay to leach experience from any jungler. Especially no sustain junglers who have weak pre 6 ganks (e.g. Wukong) NEED every bit of experience and saved health they can get. Leaching experience even though they beg you not to ULTIMATELY DOES NOT HELP YOUR TEAM. Depending on their rune setup it ruins their initial clear and can ruin the ability to gank early on / hit level 6 in time.
Leaching experience from your jungler if he begs you NOT to do so is trolling. It was in the old jungle and still is now.