Say it isn't so!!
I was watching the "regular" male at the feeder just now. Well, all of the sudden, another male came up and just knocked my "regular" off. Strange part is, this newcomer never feeds at the feeder. Now my "regular" is a bit skittish. Is this a common thing?
Bully hummer?
Hummers are very territorial, so maybe elsewhere they had a little "to do" and your regular is just a bit afraid of the newbie.