I don't know if you might be interested in my own view of me?
But here goes.
I don't have much money, and since finishing work in February, my assets dwindle alarmingly. However, despite odd failings, (because I'm human), I do try to go out of my way to be always well mannered, to the extent of making sure that the company I am in, is at least comfortable, even if I fail to make them feel downright good about themselves.
However, (there's always a, "however," isn't there?), my sense of humour is not everybodys' cup of tea, and may offend on occasion, but I hope not.
So, no, to your question, lack of money does not mean lack of manners.