They are not entitled for my money, but I always think about myself and situation like this. Like, if my CEO would spout nonsense like this tweet multiple times, I would hope the CEO gets replaced, not that the whole company goes down and ruins the life of 16.000+ people. And the company going down is pretty much the end-goal of a boycot.
If I have no proof/evidence that a major part of the people working on a game are hateful idiots, I probably would not boycot said game/company. Also boycotting companies is always pretty much colatteral damage, because even Ubisoft could have a team of idiots, then I would boycot/not buy that game and the team/hateful people would naturally be sorted out. But I would not boycot the whole of Ubisoft with thousands of employees, see my example above.
I think that is a good thing of EA, and Ubisoft has a disclaimer like this before every AC game too, I think. Stuff like this should be sorted out internally imho.
Just to be clear, I think that tweet is horrible and the person responsible should be replaced. I can also understand if you don't want to support the company, I just think about myself in the situation and I would be pretty mad if I lost my job because my marketing team are idiots.