"I work hard for this." (In some context) So do I and so do the billions people living here, people are perhaps working harder than you thought but they don't get what they deserve. The fact you work hard doesn't distinguish you from the rest, doesnt make you deserving of everything, and doesn't make you immune to criticism or misfortune.
"I have been through worse." Oh, I'm sorry, but maybe you deserve it for being unsympathetic asshole. You may have been through worse but I don't want something to do around that level.
"Back in my day..." unless you're telling a legit fact and not previous point disguised in nostalgia then screw yourself.
"I know you more than you know yourself" Lie, lie, lie. I can't wait to prove that they're terribly wrong.