Yes, but societal attitude and specifically how they affect people come down to the conglomeration of people's personal experience. I absolutely understand why people have objections to the use of "crazy" and "insane" when applied to persons or behavior that is anywhere from merely unusual (or even fairly common and "normal", but silly), to extremely odd, to irrational, passionate, or simply unhinhibited, to on the extreme end, dangerous or frightening, because obviously none of these things are either necessarily related to mental illness, nor are they an accurate reflection of most mental illness.

However, my personal experience doesn't support the idea that this usage is necessarily a major contributor to false societal impressions and depictions of mental illness, nor have I found that it has that much of an effect on how people perceive and interact with me. I also know that other people have had the opposite experience, and I am still working through weighing the combined experiences and effects before I feel comfortable making a blanket statement about usage. However, since it makes may people very uncomfortable, I refrain from using those words in reference to anyone but myself, because I do not want to hurt others. This is something I don't understand why others fall down on - if someone asks you to please not use a word, because they find it hurtful, stop fucking using it, in their presence at the very least (and recognize that if they find it hurtful, others may as well). There is no purpose served in whining about how you don't agree and why shouldn't you use it and blah blah blah BAWWWWW. Just don't.

(I do admit that I am still struggling to find words that convey the same meanings with the same punch in context, particularly in reference to fictional characters whose behavior may be, shall we say, peculiar, but not necessarily indicative of mental illness, at least within their fictional context (or indicative of mental illness, but, being fictional, not necessarily diagnosed or diagnosable.)