"I had a bad attitude towards the Canadians when entering once - they asked me if I was happy to come to their country, and I said no, it was far inferior to the US."

You lived here but you thought it was inferior...... good on the CBSA for sending your arrogant ... back to the USA ! If only they could give you a lifetime ban. Do you cop that attitude with immigration officers in every country you visit ? Do the world a favour and stay in the USA !