People Who Lean on Poles on Public Transport

What is wrong with these people?? Is it not clear to them that the poles are there for the MASSES to hold on to in order to avoid falling? The thing about these people is that they are always so self-involved that when you try to hint that they are preventing you from keeping your balance by sneakily forcing your fingers between the pole and their back, of course, apologizing, they turn around and give you a dirty look. Seriously. Hate them.