In my opinion, the issue is not the use of the term “landscape architect” — it is the very definition of “landscape” itself. Focus your efforts on changing the public mindset of the word landscape beyond the natural, the picturesque, or the antidote to urbanity (all referring to an otherwordliness) — and the public becomes much more understanding of what landscape architects actually do. Perhaps then people will stop asking you for advice on their petunias (which i hypothesize is directly correlated to your use of pencil crayons).
So, what does the word ‘landscape’ mean to you?