Apple makes optional high end direct to consumer products. I can easily switch to a cheaper computer. Or buy a used one. A computer is also something I only invest in once every few years.
Oil companies provide a service essential to normal global operation. I cannot switch to a cheaper oil company (heck, I dont even know what company supplies my energy). I can't really switch even if I did know. I can only use less energy. But I must use some. And I must use it pretty constantly.
So the reason "liberals" don't have a problem with Apple is the same reason they don't have a problem with expensive clothes; you don't have to buy them. But having a problem with oil companies is like having a problem with doctors and insurance companies who charge as much as they please (rather than a fair amount)...because you have to pay it. Energy and health care are necessary to live. Computers are not, and can be found easily.
And, just going off of the news, many energy companies take profit at the expense of having clean up systems for large disasters, improving safety, researching renewable energy, or environmental damage mitigation.
Apple on the other hand is rarely in the news for not spending money on something necessary. And when they are, they try to fix it, like Foxconn.
The majority of Steve Jobs wealth comes from Disney stock.
/corrections
Do you know what Exxon Mobile's profit margin is?