Buy-in size is a separate issue, and not one I consider particularly important...although there's no such thing as 'bullying' short stacks; the whole point of playing short is that you're not deep enough for anyone to bully you, and you get equity when bigger stacks make moves on each other. The issue of trying to insert yourself into a game where you're not wanted remains meaningful...not doing what your opponent wants within a game isn't the same as interrupting them when they wish to play somebody else, regardless of whether software allows you to do so or not.