I totally understand and agree. People should, but don't always, accept you as you are.
If I am having a bad day (mildly dyslexic but most noticeable with numbers and spoken word) then I will often mention it as a side, just saying something like I'm having a bad day with words today and ask for people's patience/understanding if I am not that clear. What I type out usually goes through MS Word first and I often use the google spell checking option or when that fails (often) simply find another word that explains the same thing.
I don't correct people because both my brother and I had years and years of being nagged by our 'parents', so I know how condescending and inconsiderate it is and as far as I am concerned if you can get the point over/make yourself understood, what is the problem? I do try to remember to add punctuation though (and break up thought patterns into new paragraphs), but it is more as my mind thinks than what is expect, so it doesn't always work. My brother is much worse than I am for written word so I guess the 5 years of extra English lessons every lunchtime at school have paid off in that respect. Ironically my brother is exceptionally gifted (seriously so) at calculus, but hates it! Strangely I have found learning and speaking German much easier than English, but I guess that is just the way my mind works and I think understanding that has helped me.
I have found ways around the 'problems' is presents over the years. I can't write numbers down if someone reads them out to me, but can copy shapes. I don't say the number to myself as I copy it because I know my mind will switch the order of the numbers or change it completely but copying shapes is easier for me. Speaking can be interesting if I am tired. We have a rule (at home) whereby if I start to switch 3 or more words around in the sentence order then I don't drive/use knives/cook etc. Its a sign that I am too tired and I am liable to cut/burn/hurt myself badly (have done). Switching 2 words in a sentence is normal, and people around me just accept it. I get the odd odd look, but normally it is just ignored because friends/family know I don't know I have done it. Very occasionally I will realise I have switched the order as my mind 'replays' the last sentence and I have been known to add "ok, that made no sense even to me". I usually just get the "don't worry, we understood".
One of the other interesting issues I have is left from right. I have sat all of my driving tests (all because I resit every 3 years for my advanced level driving tests) with drivers side and passenger side. That is something my mind has no issues with, left and right are a completely different story! When I used to teach advanced level driving, I used to have to tell the driver to go with what my hands indicate, not what I actually said!
Finally, I always make myself read each and every word, and not assume I know what I have written, before I hit the Post Reply button! That is the hardest part because I have to consciously think about what the word is that I am looking at and not assume and I can't read long paragraphs, so I have to break them up so I can understand what I have written!