I got called "a bundle of negative energy" yesterday.
Right when I was thinking the same thing about the person who said it to me!
I am not always the one rubbing off negativity, but at that moment it was me. There was this happy, smiling person, laughing and talking. Then I make one "cribby" remark and the other person's mood got soured too. It was not even anything about them, just a general comment, but that upbeat spirit felt sad listening to me.
They say when we interact with people, we see our own reflection in their attitude towards us. This is mostly true.
If you smile at someone, you're most likely to get a smile back (unless you have pissed them off big time!)
If you're nice, most likely even a rude person will get shamed into being nice to you.
If you're rude, most likely you will wipe away the smile on the other person's face.
If you're upbeat, you can lift the spirits of the most wretched and miserable person.
If you're negative, you will most likely dampen the spirits of an otherwise confident person.
So, be happy, stay positive, most likely it will rub off on others too :)