Immodesty and pride in others tends to be offensive to us.
I know I have sometimes offended people gravely by being too obviously proud of what I was doing.
I didn't like that.
But I'm thinking, modesty and humbleness are doubtlessly desirable qualities. But so is honesty. If a person, say David Bowie, has done undeniably impressive work, would you prefer him to either be unaware of that fact, or even to suppress that knowledge just not to offend?
Bowie actually is not just a good example, he is one of the reasons I thought this. In the early nineties or so, when he was in the band Tin Machine, the whole band were interviewed, and he said he'd gone back and re-listened to his back catalogue, and said: "I think I have done some wonderful work. I have to be honest..."
And I think I'd prefer him to be honest, too. It might not feel pleasant always, but it's valuable in the longer run.