When you realise “bubble” just means “loose group of people I tend to have a lot of overlapping views and interests with”, then you are just saying “is the reason you think this is bad is because of your views on what is bad” and… well, yeah.
I think you can assume that it does occur to most of us that we are all in a bubble to some extent, and that it’s important to be aware of that when forming your own views. It’s also totally possible for someone to come to a firm conclusion about the morality of a particular act without it having to be the effect of a bubble.
It’s easy to picture someone reasonably aware of the context of the invasion, including the restriction of water supplies to Crimea, NATO expansion, the background to the separatist conflicts, Euromaidan, the Azov Battalion, and all the other bits and pieces that we’ve all seen countless articles about over the past two weeks. It doesn’t seem invalid for that person to have a reasonably well-informed view that the actions of Russia are Very Extremely Bad Indeed and that there are “few gray areas”, does it?