An objection is an expression or feeling of disapproval or opposition. It’s an opinion. And, objections are healthy. When there’s change or new plans presented, there are usually objections. They represent what’s missing in your argument. Which means they can (and should) also be seen as invitations—to connect, to dig deeper, and to begin to try to solve the problem.
An excuse, on the other hand, is what you say to make them go away or stop talking about the thing they’re rambling on about. It’s a defensive response expressed out of fear; and will only send you on a wild goose chase.
Knowing the difference and acting accordingly can mean either moving you forward or holding you back, depending on how you look at it.