Is mucking wrong between friends?

[rookette22]

Here's the thing; I was at a real money table with a friend of mine and it was only the two of us that were left. I called, he folded and I mucked. Now he's upset

He says I shouldn't have mucked my hand, not between friends. I told him I usually muck when people don't call to see my hand. He thinks I bluffed him out of that hand cus I mucked. I had a pair of Jacks, no biggie but still a pair.

Is it really that bad to muck a hand if you're playing with friends?