What is the psychology of people wanting to boo someone who the ring announcer says has an,...?

It just gets annoying when guys like Sheamus and Drew McIntyre get pushed instantly and other wrestlers are their for years and some haven't even gotten the chance to get the WWE Championship and World Heavyweight title. Even the new guy on the block, Alberto Del Rio is getting a push and guys like Christian and Matt Hardy have worked with WWE for years and they are being overlooked.