You can try disabling all auto-starting in your OS (that's what I do, in Windows).
Another possibility is to disable Lr preference to auto-start for import when removable disk attached.. - sorry I don't know where that option is off-hand..
The option is in-
Preferences (CTRL+,) - General Tab- Import Options- (uncheck) "Show Import Dialog when a memory card is detected."
I want to let you know how much I appreciate your suggestion. It worked!