It's tough to go down more than the 3% that Britain was down, as they are the epicenter of this, not us. But the complacency of today's opening was too much for me. Now we are getting more realistic.

Let's not be glib. I am not worried about systemic risk here. Our banks have never been stronger. Our companies are flush with cash. The world will grow more slowly than it is now and our companies will be ready for that. We will be the safe haven.

But here's what I am worried about -- European banks. Lloyds (LYG shares are off 24%, Royal Bank of Scotland  (RBS has lost 22%, Barclays  (BCS is down 20%, Deutsche Bank  (DB - Get Report) has dropped 16% and Credit Suisse  (CS - Get Report) has shed 15%. That's very disconcerting.

These moves are ugly, and they aren't the type of thing that happens in a vacuum. This is what you should pay attention to, not our banks or our industrials or anything else except oil and interest rates. Oil is bad for the bull and interest rates are terrible for the banks.

This is a distinctly subpar situation.

(Check out other Real Money columnists take on the banks here, here and here.)

Editor's Note: This article was originally published at 1:31 p.m. EDT on Real Money on June 24.

At the time of publication, Jim Cramer's charitable trust Action Alerts PLUS held no positions in stocks mentioned.