FIRST before anyone *thinks I MEAN them*...this is about a IRL friend...though I will say I see it a lot and it's so annoying

OK Today I was emailing back and forth with a long time friend...she went to law school for a while so she's not a complete moron....so I say....what would you do and gave 2 choices on something that was time limited as well...She replies with NOTHING I mentioned and there are only 2 choices....she comes up with ... things that are way too late to do... and ...other things that would put me well past my deadline..so I thanked her and moved on..
I have seen this before not just to me but many..like someone will say...(this is JUST an example) I hate my size...so they get ....well go on a diet...WTF, do they think the person who is asking is such a moron they didn't think to do that already????.....I really cringe when I read/see/hear junk like that and just never know what to say back..
Its NOT helpful to say what they *could* have done..its not helpful to state the obvious unless they ARE stupid....I would rather have someone reply, jeeze I don't know than get trash like that as a reply...SO I was left all day today feeling near tears and unheard