The Ibrox club are on course to win the Third Division title following their re-emergence but the quality of their players has been questioned in some quarters.
McCoist said: "It's very easy to have an opinion without full knowledge of what's going on and that's the beauty of football.
"Everybody has differing opinions, that's why it is easier for me to take criticism because I am very well aware of the difficulties everybody is facing at the club.
"There have been comments from one or two ex-Rangers players who indeed, have coached and managed at a level, which are pretty ignorant because they don't know the full story and they are a little bit misguided.
"They are entitled to their opinion, of course they are, everyone is entitled to their opinion but we in here certainly don't take them too seriously.
"It certainly doesn't make me alter my focus or change any opinion of where we want to be and how difficult it is going to be to get there because that's my job and I firmly believe I will get us back to the top."