Ideally, he would have just said 'I don't want your help I just want to complain' ... but part of his frustration is probably due to a feeling of lack of contro

Ideally, he would have just said 'I don't want your help I just want to complain' ... but part of his frustration is probably due to a feeling of lack of control, in addition to needing a prescription. Having a child step in and provide assistance will likely amplify that emotion. Sometimes people just want to complain. I know I've complained and then been surprised/annoyed when people actually stepped in to help (because I really just wanted to vent my irritation and move on). Next time you feel an impulse to assist I'd recommend just directly asking the person whether they are just venting or whether they would like your help.