Only, someone with a fickle personality will allow someone else's behaviour to rub off on them. One can still be active, in a group of lazy people and be lazy in a group of active people. Our own attitude towards life matters. An inherently spirited person will not cease to be energetic if surrounded by a group of lethargic people. I think our personalities decide how much we imbibe from others. It is not a sure-shot formula that works, every time.
"A love affair with knowledge will never end in heartbreak." -Michael Garrett Marino
As adults, we can certainly learn from these motivated people who make their presence felt in a good way and pass on the positive vibes. People who are lethargic and very contended need not necessarily be bad. It's their choice, I remember an office staff from a few years ago who was very good but stayed the same place for 5 years without many ambitions, he used to say, sir, this job feeds four of us and I don't want to risk anything, maybe my son can be better. I remember him as he was happy with what he had and used to do his work sincerely that helped all the people in the office.
Yes, it's good to be with people who are energetic and get noticed but we should have our own identity. Lastly, we can be with lethargic people and we need to have a mind of our own, not be influenced by their negativity or discouraging actions.