Are you more forgiving the second time around?

I had a friend tell me that in a second marriage, particularly one which is a second for both parties, you tread lighter because you know from experience that you can each survive on your own. So, you make allowances and ignore things that would have set you off in the first one in order to stay together.
It almost seems that it would be the opposite, that knowing you can make it on your own would make you more independent and uncompromising.
What are your thoughts or what has been your experience in this situation.