There are two problems here: 1. You misstate and mischaracterize free-market ideology as having the pretense of being to the "advantage of everybody". It's potentially a byproduct but definitely not a first principle. 2. You cast a judgment of value on egotism and selfishness as being the true motivators behind free market proponents. Selfishness and egotism are human characteristics expressed across all ideological spectrums.
"Don't get me wrong, nobody has to care for others and I am not going to be the person to force you, but if you don't care about others please stop pretending you are doing it for the greater good." - Here is where you conflate utilitarian with libertarian ideology, especially as you label those who disagree with your view as pretenders and posers for the greater good, again misstating the position of your ideological opponent and then proceeding to cast a judgment of value on the positions they don't actually hold.
Not trying to be mean here, but have you thought about getting some reading comprehension lessons? It could really help you understand the things that you read as well as give you a more well rounded view things.