Generally speaking I wouldn’t mind if someone described me as vivacious. I wouldn’t take it in a negative way.
To me that means lively, energetic, and describes someone who is active and involved in many things.
I wouldn’t want to be known as dull or low energy which would be the opposite.
Is the issue that the person being described is senior? Would it be ok if a senior employee described a new college graduate that joined a company as vivacious? New graduates just starting out are willing to work hard, learn new things, introduce themselves to others on the team and attend opportunities to socialize with other coworkers. (for networking) Doesn’t that describe someone who is lively or vivacious? I am trying not to overthink this and if someone said that to me I would take it at face value and not try to think what were the persons intentions. I would take it as a compliment. I think the intention was positive in using that word.