Live and let live. Know that it's not upon us mere mortals to guide anyone. If you have some good advice and/or beneficial knowledge to share, do so, with good manners and humbleness. But don't assume everyone you meet will then accept everything you say to be right and true. And even if they don't still be your courteous and friendly self, and yeah back off when you must!

Oh and Guten morgen to you too MN...this greeting made me smile cos my mom always used to say this to us as kids, in jest, specially when we were all fussy and moody in the morn.