I was kind of partial to ... "there's a lot of tough stuff in there, I am so sorry you felt that way".
I'm a little more partial to "I am so sorry for any part I played in making your feel that way." I know the other is very standard DB validation, but my husband says that to me when he doesn't want to listen to whatever I'm saying and it comes across as very "tough [censored], sorry you feel that way", which helps nothing. It's a tone thing, no doubt, but if you're texting? Might very well be taken wrong.
